Because they were big events in history that made today be today ;)
Yes, this is generally true. Staying still in general, even if one is sitting behind and computer and typing, is generally not healthy for the body, since the body requires movement in order to maintain proper circulation.
This is kind of an opinion based answer, so ill gove you my opinion. So, before world war 2 there were specific gender roles. After, all the men had to go to war which forced the women to get jibs and work, which wasnt very commin for women. They took on all the hard labor jobs that men had to do. This basically changdd the way women were seen, they are ni longer frail and weak. Also, this brought attention to war and how it is not safe. Esoecially for japanese ppl at the time
Location changes everything especially in this case
I think the answer is B. hope this helps!