What was the “baby boom”?
a. the dramatic rise in birth rates in the U.S. from 1946 to 1964
b. the dramatic rise in the cost to raise a baby in the U.S. after World War II
c. the dramatic increase in the buying and selling for baby goods in the U.S. after World War II
d. the dramatic increase in the number of babies being adopted in the U.S. from 1945 to 1946