What led to the demise of the classic Mayans? List the four theories.
PLZ HELP

They were wiped out by another empire.

They all died of starvation.

There was a terrible illness.

They were killed in a natural occurrence. (earthquake, tornado, etc.)

Explanation:

these are the theories I can think of, but it says THE four theories. Therefore, it may be in any reading or notes you were given

answer; knowledge,reason,and judgement;

answer; /// all of the above;