If a Couple Wants to Give Birth to a Girl,which

If a couple wants to give birth to a girl,which of the following should they do to increase the odds of conceiving a female?

A) The woman should lie on her right side immediately following intercourse.
B) The couple should have intercourse as close to ovulation as possible.
C) The woman should douche with a mixture of vinegar and water.
D) The woman should eat a high calorie diet.
E) All of the above make conceiving a girl more likely.