Which one of the following factors helps to explain the drop in union membership in the U.S.?

Question

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The drop in union membership in the U.S. can be partly explained by the increased percentage of females in the workforce who hold jobs not traditionally unionized. As the workforce demographics change, sectors with lower unionization rates, such as service and retail where many women find employment, become more prominent, contributing to the overall decline in union membership.

Which One of the Following Factors Helps to Explain the Drop