Well, the use for the atomic bomb was that it was dropped on Hiroshima and Nagasaki to end the war (With Japan at least) The rest are technically true, but that wasn't really it's use. So A is you best bet here:)
In the early 1800s, only men have the right to vote (universal men suffrage). However, voting rights changed in Europe during the revolts of the mid 1800s wherein the new constitution describes and allows all men the right to vote. Also, voting rights were extended through Great Britain and France — opening opportunities for unemployed French workers.
