单选题：During 1930s, why did the percentage of 17-year-olds who gra

题目内容：
During 1930s, why did the percentage of 17-year-olds who graduated from high school jumped greatly? A．[ A ] Because they believed high school education is necessar
B．[ B ] Because they couldn't find jobs and they had no better choice
C．[ C ] Because the cost of going to school was reduce
D．[ D ] Because they believed high school education could help them make more money in the futur
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