Baby boomers are those people born between

a. 1935 and 1945.

c. 1955 and 1975.

b. 1946 and 1964.

d. 1965 and 1975.

Baby boomers are people born just after the World War 2: this was the time when the soldiers came home and a general optimism was present in the population, which led to an increase of births.

This means that the correct answer is : starting from 1946: answer b.