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 present legislation in polemical terms; this arouses in their colleagues either repugnance or enthusiasm for the legislation.

Question: Which one of the following is an assumption on which the argument depends?
Options:
A. Legislation will not benefit constituents unless legislators become less concerned with their own careers.
B. Legislatures that enact laws that benefit constituents are successful legislatures.
C. The passage of laws cannot benefit constituents unless constituents generally adhere to those laws.
D. Legislators considering a proposed law for which they have repugnance or enthusiasm do not consider the consequences that it will actually have.
E. The inability of legislators to consider the actual consequences of enacting a proposed law is due to their strong feelings about that law.
Answer: "D"