The testes of a great majority of mammals are typically enclosed in an extra-abdominal sac,the scrotum. The temperature inside the scrotum is lower than that in the abdomen. What will happen if the temperature of the scrotum is artificially maintained at the level of abdominal temperature?

• A
  The germinal epithelium will produce a large quantity of androgen secretion.
• B
  The germinal epithelium of the testes will divide faster,thus producing more sperms.
• C
  The germinal epithelium of the testes will degenerate,resulting in sterility.
• D
  The germinal epithelium will carry out normal spermatogenesis.