Given A = {a, b, c, d} and B = {1, 2, 3, 4} , sets A and B can be defined as?

c

-by-step explanation:

it would be c

b, i believe, but not sure.

no because after the troops were pulled many blacks were killed by hangings lynchings and other cruel ways which in a way interrupted the reconstruction of the south and differed from the way abraham lincoln had an idea of reconstruction