The next great civilization in the Americas was probably the Maya. In fact, archaeologists considered them the first for a long time. They were farming people who lived on the Yucatan Peninsula between 300 and 900 CE. The Maya bore a lot of similarities to the Olmec. Most Mayan men lived in villages and were advanced agriculturalists. We know this because they practiced intercropping, where certain crops are planted together, using one to stimulate the growth of the other.

The Maya also built huge cities. Some archaeologists estimate that one such municipality, Tikal, now found in Guatemala, was home to as many as 100,000 residents at one time. There were more than 3,000 buildings there, some towering high over the jungle.

The Mayans were very advanced in mathematics, astronomy, and engineering. In Tikal, this manifested in their construction of reservoirs to hold water for the city. The water moved between man-made lakes using gravity in such a manner that they must have had a deep knowledge of mathematics.

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.

C
they practiced intercropping.

D
they build huge cities.