Max and His Wife Have Five Daughters

Max and his wife have five daughters.Max was complaining to his friends that he thinks his wife must have too much estrogen and that is why they have not had a boy.Why is Max's reasoning flawed?

A) The sex of the child is determined by his wife's genetic contribution, but not because of her estrogen level.
B) The sex of the child is determined by Max's genetic contribution.
C) Both parents' genetic contributions contribute to the determination of the child's sex.
D) The sex of the child is the result of codominance, and it is the dominant parent's genetic contribution that determines the sex of the child.