How Do Males Continue to Produce Sperm Through Their Adult

How do males continue to produce sperm through their adult lives?

A) Spermatozoa can undergo cell division daily.
B) Sperm cells never die.
C) Testosterone levels remain elevated throughout adulthood.
D) Secondary spermatocytes produce an endless supply of primary spermatocytes.
E) When a spermatogonium undergoes mitosis, only one undergoes further differentiation and meiosis to become a mature sperm; the other stays a spermatogonium.