Would anyone know the correct answer for this history question?

Under what circumstances were African Americans in the South allowed to join the Confederate army?

Which one of these choices is the correct answer?

They were never allowed to serve.

They volunteered after Sherman's march.

They were drafted after Gettysberg

They were drafted after Vicksburg

The answer is that they were drafted after Vicksburg. It was until the near the last few months of the war that the Confederacy used African American soldiers. There were very few freed African Americans in the South and the vast majority of the African American soldiers were ordered to fight when the South began to grow desperate of the North encroaching on Southern territory.