James: Chemists have recently invented a new technique for extracting rhodium, an element necessary for manufacturing catalytic converters for automobiles, from nuclear waste. Catalytic converters function to remove noxious gases from automobile exhaust. The use of nuclear power is therefore contributing in at least one way to creating a cleaner environment.
Marta: The technique you mention, though effective, is still at an experimental stage, so there has been no shift in the sources of the rhodium currently used in manufacturing catalytic converters.
Marta responds to James's argument by
(A)
casting doubt on the accuracy of the claims made by James in support of his conclusion - WRONG. Marta agrees to James claim but points out another parameter that wasn't covered by James.
(B)
questioning the credibility of advocates of nuclear power - WRONG. Like A only.
(C) indicating that James is
assuming the truth of the conclusion that he intends to establish - WRONG. Conclusion is not agreed upon by Marta.
(D) pointing out a fact that James, in drawing his conclusion,
did not take into account - CORRECT. Another parameter not considered by James.
(E) pointing out that James's premises are
no more plausible than is his conclusion - WRONG. Doesn't points out that as she agrees somewhat but points out her observation.
Answer D.