John and His Wife Are Trying to Conceive

John and his wife are trying to conceive. John knows that his sperm count is slightly low. Which recommendation should John follow for the best chance of conception?

A) John and his wife should have intercourse every day for the entire week.
B) John and his wife should have intercourse twice a day for the entire week.
C) John and his wife should engage in intercourse every 72 hours, and John should masturbate every day to increase his sperm count.
D) John and his wife should have intercourse every 48 hours.