Who employed a flexible state-by-state strategy to promote women's suffrage?

A. Alice Paul

B. Miriam Florence Leslie

C. Carrie Chapman Catt

D. Harriet Stanton Blatch

"Alice Paul" was the one among the following choices given in the question that employed a flexible state-by-state strategy to promote women's suffrage. Alice Paul and Lucy Burns founded the The National American Woman Suffrage Association in the year 1913. The correct option among all the options that are given in the question is option "A".