The act of April 16, 1862 made all white men 18 to 35 years old available for military service during three years. The one your volunteer saw their enlistment extend with two years. The draft would be administered by the confederate secretary of war, who would establish draft quotas for the several states of the confederacy. On September 27, 1862 the Congress extended the age limit to 45 years of age And on February 17, 1864 All white men 17 to 50 years old became available for military service phone unlimited. Although those 17 to 18 years and 45 to 50 years old but constitute a state defense reserve not serving outside the resident state.
I want to say it is D because it is the only one that has service extended for additional two years. Even though C has the same thing but it had the extend service for additional two years and men who owned 20 enslaved men could enlist others in their place it just doesn’t really sound right to me from research I have done.
I hope this could help you out. And I’m sorry if I gave you the wrong answer for your question. I tried answering it to the best of my ability.