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Assumption. The correct answer choice is (D)
This advertisement concludes that to be smart, one should choose Clark brand-name parts. This conclusion is based on the following premises:
- Premise 1: The Clark parts satisfy the world’s toughest standards—our government tests.
Premise 2: With foreign parts you may get poor construction that will necessitate repairs.
Conclusion: To be smart, choose Clarks.
Answer choice (A): There is no reference or implication to Clarks’ being available exclusively in this country, so this is not in assumption on which the ad relies.
Answer choice (B): The ad does not make the claim that foreign made parts are unsuitable—just that they may be poorly constructed.
Answer choice (C): The author does not claim that there are no foreign parts which satisfy our government standards, but just that with foreign parts, one runs the risk of poorly constructed parts that will lead to the need for repairs.
Answer choice (D): This is the correct answer choice, reflecting the prephrased answer presented in the discussion of the stimulus above. If the ad is to base its conclusion on the premises presented, then the author must assume that Clark’s parts are better constructed than foreign made parts.
Answer choice (E): The ad claims that foreign parts may be poorly constructed—just because a part is made for a car that’s made here, that doesn’t keep it from being a foreign part. So those described in this answer choice, according to the ad may be of questionable construction as well. Thus, this cannot be an assumption on which the ad’s conclusion relies.