Not too sure maybe choice C?
Answer:
<u>Increased U.S. involvement in Vietnam</u>
1) process of Vietnamization
2) invasion of Cambodia
<u>Decreased U.S. involvement in Vietnam</u>
1) authorized bombing of Cambodia
2) diplomatic efforts by the Chinese and Soviet Union
Explanation:
A direct democracy it could also be B
I assume that it is the Yellow River China.