Answer:
D. the invasion of Cambodia
Explanation:
On May 4, 1970, almost 3,000 Ohio University students met to talk about the possibility of a peaceful strike on Athens campus in response to the invasion of Cambodia and the Kent State shootings.
C military. I believe. Either that or farming.
Postclassical. The classical era was antiquity which ended with the fall of Rome. Post means after so postclassical is after the fall of Rome which is the same as medieval.