The nurse is giving discharge teaching to a client 7 days post myocardial infarction. He asks the nurse why he must wait 6 weeks before having sexual intercourse. What is the best response by the nurse to this question?

C Have a glass of wine to relax you, then you can try to have sex.' D If you can maintain an active walking program, you will have less risk.' A You need to regain your strength before attempting such exertion.' B When you can climb 2 flights of stairs without problems, it is generally safe.'