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Sajjad1994
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Option B contradicts the intention of the said company. This company uses this filter not because it is best, but the only only filter that can be used. Hence this undermines the conclusion.
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Easy to see why this question is poorly made...

B(the presumed right answer), does nothing to the argument that IT IS THE BEST AIR FILTER.It could be the only filter that fits and it also could be the best.

Posted from my mobile device
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SajjadAhmad
Advertisement: We at Vesuvius Vacuums always give our customers what they deserve, and they deserve the very best. That’s why we use only SuperTec air filters.

Which of the following, if true, most undermines the argument expressed in the advertisement?

Conclusion : That’s why we use only SuperTec air filters

Support to conclusion : Vesuvius Vacuums always give our customers what they deserve, and they deserve the very best.

We need to undermine the support on the basis of which this conclusion is drawn.


A. In a test of three leading air filters, the SuperTec air filter performed at the same level as one of the filters and at a higher level than the other.

This answer choice shows that there may be other air filters which are as good as STAFs, but this choice does not tell why STAFs are being provided the customer and not others.

B. The SuperTec air filter is the only kind of air filter that will fit in the model of vacuum sold by Vesuvius Vacuums.

This is the correct choice. It says that VV is feeding customers with STAF because of compulsion and not because they deserve the best. Therefore, this choice weakens the big claims made by VV.

C. In a national study by a prominent consumer group, Vesuvius Vacuums gained a “superior” rating for product quality.

But does it tell whether VV is the only product with superior quality. There may be others much better than VV perhaps.

D. The customers of Vesuvius Vacuums have expressed no preferences concerning the type of air filter used in the product.

Irrelevant to the cause.

E. The specific air filter used in a given vacuum makes only a small difference in the long-term performance of that vacuum.

This is not a weakener. Small difference may be on the higher side or on the lower side. We can't say.

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