Birds secrete uric acid as their nitrogenous waste because uric ...

[j_sun]

Birds secrete uric acid as their nitrogenous waste because uric acid
A) is readily soluble in water.
B) is metabolically less expensive to synthesize than other excretory products.
C) requires little water for nitrogenous waste disposal, thus reducing body mass.
D) excretion allows birds to live in desert environments.

[sammy]

I remember it was C

[j_sun]

Thanks dude! Marking this solved.