阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。
Psychologists have discovered that even the most independent-minded of us will conform to social pressure when we are with a group of people. In one classic experiment, people were shown a vertical（垂直的） line and asked to find a line of identical length from a selection of three.
You might think that this is an absurdly easy task, and when people perform it by themselves they do it very well. However, psychologists have discovered that we are very easily swayed by the opinions of other people when we do this task in a group. In one study, a group of three people was set up, where two of the people were confederates（同伙） of the experimenter. When the confederates deliberately gave wrong answers, people were often swayed to give the wrong answer also. In fact, 75% of people gave at least one wrong answer, with some people conforming to peer pressure on every occasion.
