From 1980 to 1989, the population between the age of 25 and 44 increased by 21% because______.

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问题 From 1980 to 1989, the population between the age of 25 and 44 increased by 21% because______.

选项 A、this was the period of large inflow of immigrants at this age bracket
B、those who were born during the period of baby boom reached this age bracket
C、those who were born during the period of World War II reached this age bracket
D、this was the period of high birth rate of this age bracket

答案B

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