The Root Cause of the Battle Between Congress and President

The root cause of the battle between Congress and President Andrew Johnson was

A) Johnson's personal vulgarity and crude style of campaigning.
B) the president's former ownership of slaves.
C) Johnson's "soft" conciliatory treatment of the white South clashed with the congressional emphasis of promoting black freedom and racial equality in the South by many Republicans in Congress.
D) Johnson's "class-based" policies that favored poor whites over the white planter and manufacturing classes.
E) Johnson's underlying loyalty to the Democratic party.