C. the honen family's and all root
Interviews are in person, therefore there may be interviewer and interviewee bias in regard to the questions being asked. Only so many interviews can take place during any given period of time. Surveys eliminate interviewer and interviewee biases. And surveys can reach a large majority of people. However, surveys are only good if they are actually returned.
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The main factor was the utilization of raised field agriculture. They would build these fields that had been artificially raised to a certain height along a flowing water source (mostly rivers but occasionally streams as well in some cases). When tropical weather patterns would cause said water sources to flood, instead of washing away the crops, it would act as irrigation for the raised fields. Securing a steady food source allowed the Mayans to support a large civilization in the tropical regions they called home.
