I think that the answer is B
What caused the sinkhole?
How can we prevent it?
Where might this happen again?
It is the oldest known civilization in the Americas and one of the five sites where civilization originated independently and indigenously in the ancient world, flourishing between the 30th and 18th centuries BC. It pre-dated the Mesoamerican Olmec civilization by nearly two millennia.
D. all of the above because all portion of economy.mixed,
