What Was a Major Difference Between Births in the Early

What was a major difference between births in the early part of the 20^th century and those later in that time frame?

A) fewer births were in hospitals in the 1970's
B) more women opted not to have heavy sedation during birth during the 1970's
C) the importance of pain relief was emphasized during the 1970's
D) many women opted for midwife births in hospitals in the 1930's