Using the word "sinew" suggests that there are many components of what make peace work, and it implies that we as people must know how to be peaceful by cooperating with each other.
The sepoy mutiny was a widespread but unsuccessful rebellion against British rule in India in 1857–58. A rumour spread among the sepoys that the grease used to lubricate the cartridges was a mixture of pigs’ and cows’ lard. This had hurt both Hindus' and Muslims' religious sentiments which was one of the causes of the sepoy mutiny of 1857.
Garrison was a huge advocate for the free emancipation of slaves and the overall abolition of slavery. “burning like a fire on the national conscience” refers to the idea that most of the nation knew slavery was wrong and effected the conscious minds of everyone living here and it lingered in the back of everyone’s mind similarly to a fire
D Both A and B should be the answer