What Is True About African Americans During the Civil War

What is true about African Americans during the Civil War?

A) Many slaves escaped to Union lines, where they were put to work or even allowed to join the army.
B) Northern whites and northern free blacks both uniformly welcomed black soldiers into the Union army.
C) Lincoln permitted African Americans to serve in the navy, but not in the army.
D) They were put to work as unskilled laborers and paid about the same as white citizens for the same work.