Who was Robert La Follette? A. A Civil Rights leader during the 1950s and 1960s who participated in the Montgomery Bus Boycott. B. A robber baron industrialist whose questionable labor practices were a major impetus for the Progressive era reform movement. C. A Populist Party leader who advocated abandoning the gold standard for currency and ran for President in 1892. D. A Wisconsin governor during the Progressive Era who pioneered reforms including the income tax and the direct primary election.​