How Did the Union Treat Southern Blacks During the War

How did the Union treat southern blacks during the war?

A) Union soldiers were always more humane than southern soldiers toward blacks.
B) Union soldiers refused to accept blacks into their care.
C) Union soldiers circulated rumors of black threats of violence and arson, justifying placing them under arrest.
D) Like urban whites, Union soldiers often engaged in acts of enormous brutality, including rape and murder.