Regarding the Cardiovascular System, the Main Role(s)of the Kidneys Is/are

Regarding the cardiovascular system, the main role(s) of the kidneys is/are to

A) restore lost fluid to the blood and therefore raise blood pressure.
B) minimize fluid loss from the blood and therefore maintain blood pressure.
C) reduce blood volume and therefore reduce blood pressure.
D) restore lost fluid to the blood and therefore raise blood pressure and minimize fluid loss from the blood and therefore maintain blood pressure.
E) minimize fluid loss from the blood and therefore maintain blood pressure and reduce blood volume and therefore reduce blood pressure.