What does this line graph tell us about the demographic changes after world war ii? a. there was an increased birth rate until 1946, and then the birth rate steadily declined.

b. there was a baby boom from 1946 to 1964, and then the birth rate basically leveled out.

c. there was an increased birth rate, starting in 1946, and then the birth rate dropped until 1968.

d. there was a baby boom from 1946 to 1964, and then the birth rate rose slightly until 1999.