In Surveys, Adult Americans Have Been Asked to Choose the Sex

In surveys, adult Americans have been asked to choose the sex of child if they could have only one child. What have the results been?

A) In 1941, most preferred to have a boy but now most prefer a girl.
B) In 1941, most preferred to have a girl but now most prefer a boy.
C) The preference for boys has remained relatively constant over time.
D) The preference for girls has remained relatively constant over time.
E) Men have always preferred girls while women have always preferred boys.