The Primary Function of the Loop of Henle Is

The primary function of the loop of Henle is:

A) to generate a concentration gradient between the inner medulla and outer cortex.
B) to dilute the filtrate passing through the loop.
C) to concentrate the filtrate passing through the loop.
D) selective reabsorption of glucose and other solutes into the bloodstream.
E) active secretion of other wastes from the bloodstream.