Choice (C)

Hi LSAT Max, The explanation for (D) definitely helped, especially when the automobile industry's claims was compared to"the boy who cried wolf". I was wondering if my flawed logic to choose choice (C) had anything to do with putting more weight on the 1967 catalytic converter. I assumed that since there was a product to disprove the industry's claims that the act isn't economically feasible or environmentally necessary, then that would be a counter argument against the industry's claims. Is the converter instead supposed to show how the industry was proven wrong once before? Many thanks in advance!