Which of the Following Represent Contributions Made by Northern Blacks

Which of the following represent contributions made by Northern blacks to the North's Civil War military efforts?

A) Nearly 180,000 black enlistees serving in the Union Army following the issuance of the Emancipation Proclamation.
B) Blacks serving mostly as cooks, stewards, and firemen in the Union navy from the outset of the war.
C) The able and courageous fighting of the all-black volunteer 54th Massachusetts Infantry Regiment against Confederate armies.
D) Northern blacks serving as Union army spies and intelligence officers in the Union army.
E) Northern blacks serving as Gullah translators for Northern armies proceeding down South with Sherman's army.