Historical context can tell us important information about D. The author's purpose.
Yes you can also express your feelings if you don’t know!
Peripeteia means a turning point, reversal of circumstances. If you are referring to Antigone, then peripeteia is associated with the prophecy.
The answer is letter a. The Olmec culture is recalled today in part because it was the first Mesoamerican culture to build small cities, most particularly San Lorenzo and La Venta. It was said there were an abundant rainfall and seasonal flooding within the site the Olmec Civilization in those places.