The correct answer seems to be the first of the four. All other statements do not seem relevant, as nowhere in the passage is a description of foreign occupation, foreign affairs, or military needs. For the first, the "if" serves to say that the opportunity is still possible, so this gives hope, but the "if" can only be achieved by having all "the peace-loving nations" work together to protect peace. Thus, people must "act to secure a more certain future."
