Why did the mayan empire fall? drought disease nobody knows natural disaster

Mysterious Decline of the Maya. From the late eighth through the end of the ninth century, something unknown happened to shake the Maya civilization to its foundations. One by one, the Classic cities in the southern lowlands were abandoned, and by A.D. 900, Maya civilization in that region had collapsed.
So I would say C: Nobody knows.

I believe the answer is: C. nobody knows

1. he doesn't want to be touching other people's mouths all day.2. luck3. lawyer and architect4. he asks what you think about your future

Well you wouldnt say pretty you would say beautiful (you are so beautiful)which eres tan hermosa