Which of the following statements is true about sex ratios?

A) Based on production of sperm, we would expect the sex ratio to be 2 males for every 1 female.
B) More females than males are conceived.
C) By 20 years of age, the ratio of males to females is 1:1.
D) About the same number of males and females are born.
E) By 60 years of age, there are more males than females.