The Fundamental Issue at Stake Between Congress and President Andrew

The fundamental issue at stake between Congress and President Andrew Johnson was

A) Johnson's style of campaigning.
B) Johnson's sympathy with poor white Southerners.
C) whether the southern states would have to make substantial changes before being readmitted to the Union.
D) Johnson's lack of interest in educating and uplifting former slaves.
E) whether ex-Confederates could be elected to Congress.