The Juxtamedullary Nephrons_________

The juxtamedullary nephrons_________ .

A) have a nephron loop that penetrates deeply into the renal medulla
B) have a nephron loop that penetrates deeply into the renal medulla, and play an important role in concentrating urine.
C) are located almost entirely within the renal cortex
D) play an important role in concentrating urine
E) are most numerous