A literal reading of the phrase 'beat swords into ploughshares' suggests that people turn swords i.e. weapons of war into ploughshares i.e. farming equipment. In the figurative sense, this means that people turn away from warfare and towards a peaceful lifestyle. Paragraph 2 suggests that the new life was a 'golden age of relative peace and plenty'. So [2] is the best answer. Note that [1] is only partially correct, as it does not explain the 'ploughshares' part of the phrase. [3] is too negative, and is the opposite of what is suggested by the phrase. [4] cannot be inferred from the passage at all.