How Did President Lincoln Respond to the Confederacy's Refusal to Grant

How did President Lincoln respond to the Confederacy's refusal to grant prisoner-of-war status to captured black soldiers?

A) He ordered that blacks be removed from combat positions to limit the possibility that they would be captured.
B) He threatened to retaliate in kind on Confederate prisoners for any harm that was inflicted on Union ones.
C) He ordered his generals not to kill all enemy soldiers who fell into their hands until the Confederacy changed its policy.
D) He strongly criticized the Confederate policy,but concluded that he could do nothing about it.