According to the passage, we know the Maya were good agriculturalists because there
is evidence that
A
they studied planets and stars.
B
they built over 3,000 buildings.
с
they practiced intercropping.
D
they build huge cities.

Well since you haven't shared the passage it makes this hard. But you can rule out B and D because buildings and huge cities have nothing to do with agriculture. But they did practice intercropping so I would go with C.

Explanation:

answer; fair labor and standard act;

in about winter like late november to january