A Pregnant Woman States,"My Husband Hopes I Will Give Him

A pregnant woman states,"My husband hopes I will give him a boy because we have three girls." The nurse explains that:

A) the sex chromosome of the fertilized ovum determines the gender of the child.
B) when the sperm and ovum are united, there is a 75% chance the child will be a girl.
C) when the pH of the female reproductive tract is acidic, the child will be a girl.
D) if a sperm carrying a Y chromosome fertilizes an ovum, then a boy is produced.