The building and use of observatories allowed the Maya to develop A. complex calendars. B. hieroglyphic writing. C. slash-and-burn agriculture. D. stone pyramids and temples. B A D C

## Step 1<br />The problem is a multiple-choice question about the Maya civilization. The question asks us to identify what the Maya developed as a result of building and using observatories.<br /><br />## Step 2<br />The Maya civilization is known for its advanced knowledge in astronomy and mathematics. They used this knowledge to create complex calendars, which is why option A is correct.<br /><br />## Step 3<br />The Maya also developed hieroglyphic writing, which is why option B is correct.<br /><br />## Step 4<br />The Maya did not develop slash-and-burn agriculture, which is why option C is incorrect.<br /><br />## Step 5<br />The Maya did not develop stone pyramids and temples, which is why option D is incorrect.