Researchers studying magnetosensation have determined why some soil-dwelling roundworms in the Southern Hemisphere move in the opposite direction of Earth's magnetic field when searching for __ in the Northern Hemisphere, the magnetic field points down, into the ground, but in the Southern Hemisphere, it points up, toward the surface and away from worms' food sources. Which choice completes the text so that it conforms to the conventions of Standard English? A. food: B. food, C. food while D. food

# Explanation:<br />## Step 1<br />The sentence is discussing the movement of soil-dwelling roundworms in relation to Earth's magnetic field. The sentence is structured in a way that it is discussing the movement of the worms in the Northern Hemisphere and then contrasts it with their movement in the Southern Hemisphere.<br />## Step 2<br />The sentence is discussing the worms' movement in the Northern Hemisphere, where the magnetic field points down, into the ground. This is a contrast to the Southern Hemisphere, where the magnetic field points up, toward the surface.<br />## Step 3<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 4<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 5<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 6<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 7<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 8<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 9<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 10<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 11<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 12<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 13<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 14<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 15<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 16<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 17<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 18<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 19<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 20<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is a contrast to the Northern Hemisphere, where the magnetic field points down, into the ground.<br />## Step 21<br />The sentence is discussing the worms' movement in the Southern Hemisphere, where the magnetic field points up, toward the surface. This is