Harriet beecher stowe's book, uncle tom's cabin, is believed to be about slave booker t. washington josiah henson frederick douglass william carney

The answer would be: Joriah Henson
Joriah Henson has been a slave ever since he was born in the state of Maryland. Throughout his time, Henson has written several books that depicted the cruel reality of slavery that based on his real life experience. In 1876, all of those stories was collected under  Uncle Tom's Story of His Life: An Autobiography of the Rev. Josiah Henson

Ibelieve that the answer is (a).