Advertisement: Most power hedge trimmers on the market do an adequate job of trimming hedges, but many power hedge trimmers are dangerous to operate and can cause serious injury when used by untrained operators. Bolter Industries’ hedge trimmer has been tested by National Laboratories, the most trusted name in safety testing. So you know, if you buy a Bolter’s, you are buying a power hedge trimmer whose safety is assured.

The answer to which one of the following questions would be most useful in evaluating the truth of the conclusion drawn in the advertisement?

(A) Has National Laboratories performed safety tests on other machines made by Bolter Industries?
(B) How important to the average buyer of a power hedge trimmer is safety of operation?
(C) What were the results of National Laboratories’ tests of Bolter Industries’ hedge trimmer?
(D) Are there safer ways of trimming a hedge than using a power hedge trimmer?
(E) Does any other power hedge trimmer on the market do a better job of trimming hedges than does Bolter Industries’ hedge trimmer?

Source: LSAT
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Power hedge trimmer does its job. But may cause injury to untrained operators. BI's hedge trimmers are tested by NL, which is a trusted safety company. So BI's hedge trimmers are safe.
To evaluate the argument, we have to check whether the BI's hedge trimmers are really safe to be used even by untrained operators.

(A) Has National Laboratories performed safety tests on other machines made by Bolter Industries? - Incorrect - Irrelevant
(B) How important to the average buyer of a power hedge trimmer is safety of operation? - Incorrect - We are not concerned about the average buyers importance to safety. We are concerned about the safety of BI's hedge trimmer.
(C) What were the results of National Laboratories’ tests of Bolter Industries’ hedge trimmer? - Correct - If the results were positive then its safe. If not then its not safe to be used.
(D) Are there safer ways of trimming a hedge than using a power hedge trimmer? - Incorrect - Irrelevant
(E) Does any other power hedge trimmer on the market do a better job of trimming hedges than does Bolter Industries’ hedge trimmer? - Incorrect - Irrelevant

Answer: C

I'd go with C. If the results are bad, you definitely don't buy a product the usage of which is safe.