In the years leading up to the Civil war, how were the North and South different economically?

For years, textbook authors have contended that economic difference between North and South was the primary cause of the Civil War. The northern economy relied on manufacturing and the agricultural southern economy depended on the production of cotton. ... The clash brought on the war.

if it were me, i would pick c. c is the best answer because it's basically saying go on a non-violent strike for india