__ bacteria grow best below pH 5.5 A. Acidophiles B - Neutrophiles C . Thermophiles D. Basophiles

The correct answer is A. Acidophiles.<br /><br />Acidophiles are bacteria that thrive in acidic environments, typically with a pH below 5.5. They have adapted to survive and grow in low-pH conditions, which can be harmful to other types of bacteria. Acidophiles are commonly found in environments such as acidic soils, volcanic areas, and certain industrial settings where acidic conditions prevail.