Young people believe efforts to reduce pollution, poverty, and war are doomed to failure. This pessimism is probably harmful to humanity's future because people lose motivation to work for goals they think are unrealizable. We must do what we can to prevent this loss of motivation and therefore must enable our children to believe that better futures are possible.
Which one of the following is an assumption on which the argument depends?
(A) Motivating people to work to solve humanity's problems will enable them to believe that the future can be better and
will cause them to be less pessimistic. - WRONG. Whether they become pessimistic or not is subjective. Additionally, this is a case reversal from the passage.
(B) Enabling people to believe that better futures are possible
will help prevent the loss of motivation that results from pessimistic beliefs about the future. - CORRECT. The building blocks of the passage are belief of better futures, less loss of motivation to work and less pessimism about future. This choice relates all well.
(C)
Optimism about the future is better than pessimism, even if that optimism is based on an illusory vision of what is likely to occur. - WRONG. Not related. Irrelevant.
(D) If future generations believe that the future can be better, then pollution, poverty, and war
will be eliminated. - WRONG. Case reversal again like it was in A.
(E) The current prevalence of such problems as pollution and poverty
stems from previous generations' inability to believe that futures can be better. - WRONG. Not hitting the right chords. Irrelevant.
Answer B.