Stanley Lieberson's Research on First Names in the United States

Stanley Lieberson's research on first names in the United States found that:

A) it is more common for names to cross from men to women over time than vice versa.
B) it is more common for names to cross from women to men over time than vice versa.
C) with the exception of a few androgynous names, names don't cross between boys and girls over time.
D) children's names do not follow any noticeable patterns over time.