You have one and only one wish with just two choices, eternal world?
Okay, first I hire a lawyer to advise on negotiations with the genie. I have read too many stories of people getting what they wish for. How is this world Peace accomplished? Killing everyone would leave things very peaceful afterwards. So would brainwashing everyone to be zombies. If people remain human and with free will then we have a serious social engineering challenge. Maybe a law that all the richest people in a country are required to be the ground troops in any war. (I can see it now: Batman Conquers France, film at eleven.) As for the other option, I assume you meant descendants? Fine print on this one tooif it doesn't prevent murder or torture, then I would not subject my line to being a hated and persecuted minority. I would have to go with option A.