If legislators are to enact laws that benefit constituents, they must be sure to consider what the consequences of enacting a proposed law will actually be. Contemporary legislatures fail to enact laws that benefit constituents. Concerned primarily with advancing their own political careers, legislators their colleagues either repugnance or enthusiasm for the legislation.
What this question is testing
Your task
Find the assumption the argument requires in order for its conclusion to hold.
Common trap
Answers that would help the argument but aren't strictly required (sufficient, not necessary).
Winning move
Negate each choice — the right one breaks the argument when negated.
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