Letter A can't be correct, as no war criminals are prosecuted in the League of Nations.
Letter C is not correct, as their were communists nations that were part of the United Nations.
Letter D is not correct, as there were more than just European and American nations involved in the United Nations.
That's why B is correct. The League of Nations was founded on the idea of international peace.
The United Nations agreed upon the goal of international peace as their
main focus when developing their covenant. The United Nations had a very
similar goal as well.
The person could not be voted on because of the values that the members would have, because the vote would be more randomly given than correctly in relation to voting. Voting at the House of Representatives should be more than just your personal values. Because the senators and representatives are elected by direct vote.