There are a lot of reasons for this! 1942 features many intense moments for the world, including the Battle of the Coral Sea, the Battle of Midway, Stalingrad, and the Manhattan Project. I think the most important is the Manhattan Project, because this is what is usually publicized (at least in American history) as the "final straw" of the Allies.
THE ANSWER IS C. the spirtual reform of the catholic church
I think number 3 is correct