What was distinctive about the Mayan culture in comparison with other

What was distinctive about the Mayan culture in comparison with other early American cultures?

A) The Mayans were the only culture to develop a fully functional written language.
B) The Mayans practiced human sacrifice extensively.
C) The Mayans subjugated other nearby tribes in pursuit of people and goods.
D) The Mayans had developed sophisticated systems of mathematics and a calendar that projected time into the future.

ANSWER
Answer: A