​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 agianst 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