Human Males Continuously Produce Sperm and Remain Fertile Throughout Their

Human males continuously produce sperm and remain fertile throughout their lives; this ability is most likely the result of

A) conversion of testicular tissue into induced pluripotent stem cells.
B) differentiation of surplus cell types, such as red blood cells, into sperm.
C) the ability of adult stem cells in the testes to regenerate themselves throughout the life of a male.
D) totipotent cells in the testes constantly undergoing meiosis.