The author concludes that if you want to improve society, then you shouldn’t believe that people can’t change society. Why? If someone has this belief, they will feel too helpless to make societal change.

This argument features a conditional conclusion and a single conditional statement as a premise. We can translate them both as follows:

Premise: If you believe that people can’t change society, then you will feel helpless to change it.

Conclusion: If you want to improve society, then you shouldn’t believe people can’t change it.

This argument features a classic link assumption and assumes that those who feel helpless to change society will not want to improve it. Our right answer choice must link these two ideas. We’ll take the contrapositive of the conclusion to make things easier to understand, and diagram it as follows: