Final answer:
The correct answer is option C) Mary Elizabeth Lease.
Step-by-step explanation:
The woman who emerged as the dominant figure in The Populist Party with regards to advocacy and oratory was Mary Elizabeth Lease. She was known for her passionate speeches and activism during the Populist movement. Although other women like Susan B. Anthony and Elizabeth Cady Stanton played significant roles in the women's rights movement and the fight for universal suffrage, Mary Elizabeth Lease is most prominently associated with the Populists.
Elizabeth Cady Stanton and Susan B. Anthony were both key figures in the women's suffrage movement and involved in the activism that led to the formation of the National American Woman Suffrage Association (NAWSA). However, the question about the dominant female figure in The Populist Party specifically does not pertain to their suffrage work, but to the work of Mary Elizabeth Lease within the Populist framework.