Passage Summary: A political scientist claims that because people get bored with voting when they think the government is useless for big social changes, the only reason fewer people are voting is that they think politicians are helpless.

Conclusion: The decline in voter turnout is caused solely by the growing belief that politicians are unable to solve major issues.

Reasoning: People lose interest in voting when they believe problems require social shifts that the government cannot trigger.

Analysis: The author makes a massive leap from a contributing factor to the exclusive cause of the decline in voting. Just because a specific belief can make people unenthusiastic doesn't mean it is the only thing keeping them away from the polls. Look for an answer that points out the argument ignores other potential reasons for low turnout, like inconvenient polling hours or a lack of interesting candidates. It is a classic case of 'this one thing happened, so it must be the only reason why,' which is a logic trap as old as time.