Nixon cited executive privilege during his: 1) Refusal to hand over tapes of White House conversations.
2) Oversight of the Vietnamization policy.
3) Attempt to fire the special prosecutor
4)
Appointment of Warren Burger to the Supreme Court.

pretty sure it is c

explanation:

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.

the answer is hope this you.