The Scrotum,the Inguinal Canal Outside the Abdomen in Which the Testes

The scrotum,the inguinal canal outside the abdomen in which the testes are suspended,is essential in the males of mammals because

A) sperm must be closer to the penis to be ejaculated.
B) there is not enough space in the abdomen to grow properly.
C) lower temperature is required for normal development of sperm.
D) there is too much hormonal influence if they remain in the abdomen.
E) all of thesE.