In a trial, two groups of people were shown images containing either happy faces or sad faces. Thereafter, both
groups were all offered champagne. Those who had seen images with happy faces drank twice as much as those
who had seen images with sad faces. This suggests that advertising champagne using images with happy faces
would be an effective way to increase sales.
In order to evaluate the strength of the argument above, it would be most helpful to run a similar experiment that
A. compared the effect of viewing happy images without faces to that of viewing sad images without faces
B. measured the consumption of various wines other than champagne subsequent to the showing of other types of
C. asked both groups how they felt after seeing the images and drinking the champagne
D. used champagne advertising images without faces in place of the images with sad faces
E. measured the correlation between the groups’ perceptions of how happy they were at the beginning of the trial and
how much champagne they thought they drank
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