Public policy is:
a. anything public
c. actions taken by interest groups
b. the goals and actions taken by the government
d. actions taken by political parties

(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.

detente translated to english means politics