SAT Question 75f49353: Form Structure And Sense answer and explanation

English - Form Structure And Sense - Subject Verb Agreement
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The Progressive Era in the United States witnessed the rise of numerous Black women’s clubs, local organizations that advocated for racial and gender equality. Among the clubs’ leaders ______ Josephine St. Pierre Ruffin, founder of the Women’s Era Club of Boston.
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Difficulty:Medium
Which choice completes the text so that it conforms to the conventions of Standard English?