Situation Amy and Keith,both in Their Mid-Twenties,have Decided to Have a a Baby.Both

Situation
Amy and Keith,both in their mid-twenties,have decided to have a baby.Both are in good health and are physically active,although Keith is a smoker.Amy maintains her weight at about 125 pounds.While they know that parenting is a big responsibility,they are excited about the idea of becoming parents.The one thing that they are concerned about is the history of genetic illnesses that exists in each of their families.After 6 months of not being successful in conceiving,Amy is concerned that she may be infertile.She wants to see a fertility specialist.
-What action can Amy or Keith take to increase their chances of conceiving?

A) Amy should douche with an alkaline solution prior to intercourse;her vaginal fluids may be too acidic for the sperm.
B) Keith should quit smoking.
C) Amy and Keith should limit their frequency of intercourse so that Keith can build up a store of sperm.
D) Amy and Keith should take vitamin E supplements.