During the year 1778, which of the following NCO ranks existed?

In the year 1778, the ranks of Corporal and Quartermaster Sergeant were indeed part of the military structure. The role of a Corporal, typically the lowest non-commissioned officer rank, has historically been seen as a leadership position, assisting in the supervision of soldiers. The Quartermaster Sergeant manages supplies and logistics, playing a critical role in ensuring that troops are well-equipped.

At this time, during the American Revolutionary War, the structure of the military was still developing, and these ranks were essential to maintaining order and efficiency within the troops. The presence of lower ranks like Corporal indicates a progression in the NCO ranks that was rapidly evolving during this period.

The other options mention ranks that either did not exist at that time or were not commonly recognized. For instance, in 1778, the ranks of Sergeant Major, Major, Captain, Staff Sergeant, and Sergeant First Class were either not established in the same form as they are today or did not exist as official ranks in the Continental Army.