I cannot but regard oppression in every form and most of all, that which turns a man into a thing with indignation and abhorrence. Not to cherish these feelings would be recreancy to principle. They who desire me to be dumb on the subject of Slavery, unless I will open my mouth in its defence, ask me to give the lie to my professions, to degrade my manhood, and to stain my soul.

William Lloyd Garrison, 18545
Which of the following terms accurately describes the author of this excerpt?
A. Abolitionist
B. Colonialist
C. Feminist
D. Imperialist