Choose the Likely Explanation for the Evolution of Salt Glands

Choose the likely explanation for the evolution of salt glands in ocean birds.

A) Ocean birds eliminate too much water via their kidneys such that they cannot process the excess salt.
B) All ocean birds need to be able to drink seawater.
C) Ocean bird kidneys cannot significantly concentrate urine enough to eliminate the excess salts consumed in their diet.
D) Ocean bird kidneys cannot significantly eliminate uric acid enough to eliminate the excess salts consumed in their diet.