The most accurate answer to why women became increasingly involved in reform movements during the Progressive Era is:
A. Denied the right to vote, women looked for other ways to have a meaningful impact on society.
This option best captures the spirit of the Progressive Era, where women sought to influence social, political, and economic issues through reform initiatives, despite their lack of suffrage. Women's involvement in various movements, such as temperance, labor rights, and suffrage activism, was a way to assert their influence and push for change in society.