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[safazal]

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?

Official Answer:

SPOILER: C

[ankitsheth]

Here, the argument says that National Laboratories (NL) have tested Bolter's product and hence, the product is safer even when untrained operators use it.

Additional information needed
- Did the test by NL also include how safe is the product when used by untrained operators?
- What are the safety test results? Did NL certify and pass the safety test on Bolter's product or did NL fail the product?

Any of this information can lead us to judge the argument. C does exactly this.
A - irrelevant
B - Regardless of importance, the argument mentions that it safe. Irrelevant
C - Addresses the above missing information
D - Even if there are other ways, the argument is about Bolter's product being safer than all other competing products
E - Who cares? Its about safety.

[Linux]

Agreed ans is C

[gaurav_inf]

C it is

[vedigaurav]

Answer is C.
Results of tests were missing from the argument.

[tieuphong]

This question is a bit tricky.

[skarya]

I picked C

[Vivek Goyal]

'C' wins hands down.