Solution:Frederick Douglas was an American social reformer, abolitionist, orator and writer. He worked tirelessly to make sure that emancipation would be one of outcomes of war. He recruited African - American men to fight in the U.S. Army, including two of his own sons. After escaping from slavery in Maryland, he became a national leader of the abolitionist movement in Massachusetts and New York.
Thus, option (d) will be correct answer.