单选题:根据下面的内容,回答题.What does the passage mainly discuss?

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题目内容:
根据下面的内容,回答题.

What does the passage mainly discuss? A.The economic development of the Unites States in the eighteenth century.
B.Ways in Which economic development led to social changes in the United States.
C.Population growth in the western United States.
D.The increasing availability of industrial jobs for women in the Unites States.

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