Which Tactic Did Abolitionists Use Most Often in the 1820s

Which tactic did abolitionists use most often in the 1820s and 1840s?

A) funding and arming slaves who were willing to rebel against their owners
B) presenting slavery as morally wrong
C) presenting slavery as an economic threat to northern states
D) funding candidates who promised to enact abolitionist agendas
E) convincing slave owners to voluntarily free their slaves