In what way did Frederick Douglass help contribute to the abolitionist movement? A. by founding an anti-slavery society. B. by bringing lawsuits against slaveholders. C. by making public lectures across the nation. D. by encouraging slaves to fight for their freedom.

Frederick Douglass significantly contributed to the abolitionist movement primarily through C. by making public lectures across the nation. As a former slave who became a powerful orator and writer, Douglass traveled extensively to speak about the injustices of slavery, share his own experiences, and advocate for abolition. His speeches and writings galvanized public opinion against slavery and inspired many to join the abolitionist cause. While he was also involved in founding anti-slavery organizations and supporting various forms of resistance, his public speaking was one of his most impactful contributions.