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Researchers asked volunteers to imagine they were running a five-kilometer race against 50 people and then against 500 people,races in each of which the top 10 percent would receive a $1,000 prize.Asked about the effort they would apply in the respective cases, the volunteers indicated,on average,that they would run slower in the race against the greater number of people. A likely explanation of this result is that those of the volunteers who were Most comparatively inclined-those who most tended to compare themselves with others in the social environment—determined (perhaps unconsciously) that extreme effort would not be worthwhile in the 500-competitor race.
Which of the following would, if known to be true, most help justify the explanation offered above?
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