The government has spent heavily to clean ground water contaminated by toxic chemical spills. Yet not even one spill site has been completely cleaned, and industrial accidents are spilling more toxic chemicals annually than are being cleaned up. More of the governments budget should be redirected to preventing spills. Since prevention is far more effective than cleanup, it makes little sense that the entire annual budget for prevention is less than the amount spent annually on one typical cleanup site.
The proposal about how the governments budget should be redirected plays which one of the following roles in the argument?
(A) It represents an unsupported speculation.
(B) It both supports another claim in the argument and is supported by others.
(C) It is the claim that the argument as a whole is structured to support.
(D) It is a presupposition on which the argument is explicitly based.
(E) It presents an objection to another proposal mentioned in the argument.