Ben and Natalie Are Having Difficulty Conceiving, Although Both Have

Ben and Natalie are having difficulty conceiving, although both have children from previous relationships. What does the textbook tells us about the cause of infertility being a male or female problem?

A) It is predominately a woman's problem.
B) It is predominately a man's problem.
C) The problem lies with the man about 40% of the time.
D) The problem lies with the woman about 80% of the time.