"Having determined to use the negro as a soldier, there is no way but to give him all the protection given to any other soldier. The difficulty is not in stating the principle, but in practically applying it. It is a mistake to suppose the government is indifferent to this matter, or is not doing the best it can in regard to it..." What does Lincoln's speech reveal about the participation of Black soldiers in the Civil War?

A. Lincoln objected to using African Americans as soldiers, as they were untested in battle.

B. Lincoln wanted to convince African Americans that participating in the war would help them be free.

C. Lincoln thought freed slaves should fight on behalf of those still enslaved in the South.

D. Lincoln was concerned that they could face more severe consequences from southerners than white soldiers.