Na⁺ is always reabsorbed in the ___________ but is only reabsorbed in the ___________ under hormonal influence.

A)descending limb of nephron loop; ascending limb of nephron loop
B)ascending limb of nephron loop; proximal convoluted tubule
C)ascending limb of nephron loop; distal convoluted tubule
D)descending limb of nephron loop; distal convoluted tubule