Why Are the Male Gonads Held Outside the Body Cavity

Why are the male gonads held outside the body cavity?

A) Normal body temperature is too high for spermatogenesis.
B) Normal body pH is too low for spermatogenesis.
C) Gonadotropins are inactivated at normal body temperature.
D) Sperm development proceeds much slower at normal body temperature.
E) Leydig cells will die at normal body temperature.