What was william lloyd garrison's greatest contribution to the cause of abolition? a. his publication of the newspaper the liberator b. his work on the underground railroad c. his best–selling novel uncle tom's cabin d. his posters warning blacks about the fugitive slave law

The correct answer is A.

Garrisons paper, the Liberator, was one of the most influential pieces of writing of the 19th century. This magazine was unique in the sense that it called for absolute and immediate end to slavery. This idea was seen as somewhat radical, as many US citizens wanted to keep slavery or gradually abolish it. Garrisons paper inspired abolitionist all over the country to speak up and demand emancipation.