option E completes the argument by stating that familiar product choices were made to counter stress.
BunuelIn a research study, participants were asked to choose between two brands of a certain type of product: one familiar, one unfamiliar, and report their choice to the researchers. Before making the choice, one group was told emphatically to hurry, as the researchers were behind schedule and pressed for time; the other group was told that the project was ahead of schedule, giving them ample time to make the decision. Every participant in the former group, but only about two-thirds of the latter group, chose the familiar brand. Since the participants self-reported equal amounts of stress in their current lives, the researchers concluded that the sight of a well-known product countered the extra stress of being rushed for the first group. The soundness of this conclusion, however, cannot be assessed without taking into account _________.
Which of the following most logically completes the argument above?
(A) any differences in the frequency or geographic span of the two brands’ advertising
(B) how much participants enjoyed or valued the activities most commonly associated with the products
(C) the degree of importance ascribed to the product by the researchers in their instructions to the participants
(D) the nature of the events or situations causing stress in the participants’ lives outside of the experiment
(E) the number of factors that participants thought necessary to consider in judging the unfamiliar product relative to the familiar one
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