Why the testes in human are situated outside the abdominal cavity within a pouch called scrotum?

Options

A. There is not enough space in pelvic area for the testicles
B. The scrotum helps in maintaining the low temperature of testes, `2.5^(@)C` lower than normal body temperature required for spermatogenesis
C. Providing more space for growth of epididymis
D. The scrotum helps in maintaining the high temperature of testis, 2.5°C higher than the normal body temperature required for spermatogenesis

Answer

B