The Major Reason Why Pharmacotherapy of Male Infertility Is Less

The major reason why pharmacotherapy of male infertility is less successful than is pharmacotherapy of female infertility is:

A) Males are typically less compliant in adhering to a medication regimen than are females.
B) It is more costly to treat male infertility than female infertility.
C) Endocrine problems affect only about 5% of males.
D) It takes more time to treat male infertility than female infertility.