It should be that the Japanese surrendered. I hope this helps, if you need clarification let me know.
To that end, Congress passed the Selective Service Act, which Wilson signed into law on May 18, 1917. The act required all men in the U.S. between the ages of 21 and 30 to register for military service. Within a few months, some 10 million men across the country had registered in response to the military draft.
So it is D
I'd say C for 10, D for 11, and A for 12.
But you might want a second person to verify.
