If D is true, we are given that competitive people believed that they were less likely to win with more people. Hence it makes sense that they would feel that extreme effort would not be worthwhile in the 500 participant race. Then our explanation makes more sense. Correct.
LC: top10% get $1000, volunteers inclined to run slower in 500 VS 50 --> extreme effort would not be worthwhile in the 500-competitor race (explanation)
justify the explanation: 需要和说的原因沾边: 只有D
Improvements in the quality of the advertising materials used in mail that is carefully targeted to individuals can improve the response rate for such mail. 重点在quality而不是target 跑题。
d错
中间的conclusion:They reason that, since top executives evidently have faith in the bank's financial soundness, those worrisome rumors must be false.
The first describes evidence that has been taken as supporting a conclusion; the second gives a reason for questioning that support.