What Has Been the Statistical Trend for Age at First

What has been the statistical trend for age at first marriage for women?

A) Between 1920 and 1940, it rose. By 1950, it dropped substantially. From the 1960s, it began rising again and hasn't stopped since.
B) It has been rising since the 1900s along with women's education.
C) Between 1900 and 1950, it rose. By 1950, it dropped substantially, and it has been dropping ever since.
D) Between 1920 and 1940, it rose. Between 1950 and 1970, it dropped substantially. After women's liberation in the mid-1970s, it began to rise again.