✔ 最佳答案
A.) He is an hour late for the concert due to traffic congestion will change the cost to an individual of attending a concert because the concert offers the expected return whether he is late or not.
B.) His view is blocked by the audience in front of him will change the cost to an individual of attending a concert because the concert offers less than the expected return.
C.) The singer performs badly will change the cost to an individual of attending a concert because the concert offers less than the expected return.
D.) The concert overruns by an hour will change the cost to an individual of attending a concert because the concert offers more than the expected return
Therefore, Answer (A) is correct.
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