I believe the answer is D. WWI was the first "total war," in which all of the people in all of the involved countries participated and were impacted.
They used them by having the Indians work and change religions
On May 31, 1961, Meredith, with backing of the NAACP Legal Defense and Educational Fund, filed suit in the U.S. District Court for the Southern District of Mississippi, alleging that the university had rejected him only because of his race, as he had a highly successful record of military service and academic courses.
For the first question I believe is D, and the second question I think is D as well