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Premise 1: Clark brand name parts are made for cars manufactured in this country.
Premise 2: they satisfy all the government's automotive tests.
Premise 3: for foreign made parts, you never know which one might be cheap look-alike and reliable.
Conclusion: you should prefer Clark brand name parts to foreign made parts.
The question is asking for the necessary assumption of the stimulus. I picked the right answer. But, upon second look, I think even the right answer, strictly speaking, seems to be wrong....
Answer C, the supposedly right answer, states that "parts that satisfy our government standards are not as poorly constructed as the cheap foreign-made parts".
It doesn't seem to me the negation of this answer choice necessarily undermines the original argument. For I read the premise 3 of the stimulus as only implying that, in contrast to foreign made parts, you COULD KNOW which one might be cheap look-alike and reliable in the case of Clark brand name parts, which means Clark brand name parts could contain cheap and unreliable parts just as foreign made ones do. The only difference is you can tell the difference in the case of former, but not the latter. For answer C to be the necessary assumption of the original argument, however, we need to read that premise 3 as implying that Clark brand name parts are INDEED NOT cheap look-alike and reliable, which seems to me a bit too strong an inference to be made.
Furthermore, nothing in the stimulus implies that cheap and unreliable foreign-made parts cannot satisfy the government automotive standards.
Can someone help point out if I miss anything? Am I reading too much into the stimulus?
7 sage needs to update all their LR explanations with this guy's. His explanation is superior to JY's lol