Which of the following formed the vanguard of progressive reform?

Question

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The new middle class, made up of white-collar professionals and managers, were the driving force behind many progressive reforms. They believed that government had a responsibility to address social and economic problems caused by industrialization and urbanization. Their efforts resulted in reforms such as the Pure Food and Drug Act, the Meat Inspection Act, and the establishment of the Federal Reserve System. While other groups, such as the working class and ethnic minorities, also played a role in the progressive movement, they were not necessarily the vanguard or leading force behind it.

Which of the Following Formed the Vanguard of Progressive Reform