Which factor has played a significant role in the growth of the dual-income family model?

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A rise in the number of college-educated menA surge in birth ratesThe transition of the U.S. economy from manufacturing to service sectorsAll of the above

Explanation

The expansion of the dual-income family model is largely influenced by the shift in the United States economy away from manufacturing jobs toward service-oriented industries, which has increased opportunities and the need for dual earners.