Which is the most likely reason Whittier became involved with the abolitionist movement?

Whittier became involved with the abolitionist movement because he believed in the unjustness of slavery and felt morally compelled to fight against it. He was also influenced by his Quaker upbringing, which emphasized social justice and equality for all individuals. Additionally, Whittier was inspired by fellow abolitionists and believed in the power of literature and poetry to effect social change.