Which of the Following Has Research Found to Be True

Multiple Choice

Which of the following has research found to be true of infertility in men?

A) Men exposed to environmental estrogens are protected from infertility.
B) Abstaining from vaginal intercourse increases a man's sperm count.
C) The quality and motility of male semen declines with age.
D) The most common cause of infertility in men is pelvic inflammatory disease (PID) .