What Benefit Did Republicans See in Having Andrew Johnson Run

What benefit did Republicans see in having Andrew Johnson run as Abraham Lincoln's vice president in 1864?

A) He was an inspiration to working-class people in poverty.
B) As a former slaveholder, he demonstrated that one could live without slaves.
C) He was one of many southern senators from a state that seceded who refused to leave the U.S. Senate.
D) Lincoln's party hoped to build a Republican base in the South.
E) Tennessee was Lincoln's favorite southern state, since he was born there.