Slavery should be abolished- this common belief was held by Frederick Douglass, William Lloyd Garrison, and John Brown.
Option: C
Explanation:
Frederick Douglass, William Lloyd Garrison and John Brown are active socialist, reformer and writer. All of them belongs to the era which deals with the slavery system. All of them strongly oppose the slavery. They were in favor of determinism. Under their supervision American civil war was continued.
Slavery is a system in which people forcefully brought from other countries to follow the orders of higher classes in the society. Economically weak and deprived class, the tribals from various parts of America forced to be slaves.