Which of the Following Is the Most Important Factor Explaining

Which of the following is the most important factor explaining why, in most species, there are similar numbers of males and females?

A) Species with similar numbers of males and females grow the most quickly.
B) The existence of fewer females would lead to much more male violence.
C) A gene that made more of one sex would eventually be outcompeted by genes that increased the rate of the other sex.
D) Offspring need fathers and mothers equally.
E) Species with uneven sex ratios have more difficulty shedding harmful mutations.