Why Must Water That Has Moved to the Interstitial Fluid

Multiple Choice

Why must water that has moved to the interstitial fluid in the medulla be quickly removed from the interstitial fluid?

A) to prevent dilution of urine
B) to prevent destruction of the concentration gradient necessary for water reabsorption
C) to equilibrate the concentration of solutes in the cortex and medulla
D) to maintain an environment for transport of nutrients