How did corn cultivation develop large civilizations in central and south america?

Since there are no answer choices. Here is my best answer :)

It gave the civilizations plenty of food because corn was easy to grow and plentiful. It could've been used for trade and currency. The abundance of corn helped the civilizations grow and develop.

Before cultivation era, civilizations were mostly hunter-gatherers or nomads. (Travelling from place to place.) Cultivation allowed the tribes to settle down to form a civilization.

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1920 census

the census was scheduled for january the 1st, as the government believed that more farmers would be in their homes by that time instead of april. the census did not ask about unemployment, the number of children, and how long was a couple married were not taken into consideration. individuals were considered as residents of the places they normally slept, not the places were they worked at or visited.

2010 census

the census was scheduled for april 1st, 2010. it was the shortest census in history: it only contained 10 questions related to name, age, gender, ethnicity, relationship, and whether the citizen owned a home or rented one. the government launched a website in order to provide the citizens with information regarding the census. there were also "teach census weeks" in schools nationwide.

The answer is option b and c.