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Advertisement: In a carefully controlled study, blindfolded volunteers ... ...

Advertisement: In a carefully controlled study, blindfolded volunteers were divided evenly into five groups. Each volunteer tasted Sparkle Cola and one of five competing colas, each group tasting a different cola. Most of the volunteers said they preferred Sparkle Cola to the competing cola tasted. This shows that Sparkle Cola elicits a more favorable response from consumers than any of the competing colas tested.

The reasoning in the advertisement is most vulnerable to criticism on which one of the following grounds?

(A) It overlooks the possibility that a generalization true of the entire group of volunteers was not true of each of the five smaller groups.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT70 (Oct 2013): Logical Reasoning A

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