After the first two trials have been completed, the confederates begin giving a wrong answer.
Will the real participant continue to give the correct answer or will that person conform to the group standard?
On the third trial, the correct answer is clearly Line C, but all the confederates choose Line A.
The real participant is amazed, but calls out “Line C”.
On Trial 4, all the confederates choose Line B, which is clearly not correct.
The real participant defies the group one more time by choosing Line A, the correct answer.
But on Trial 5, when the confederates all choose Line C, another wrong answer, the real participant says “Line C.”
The real participant defied the group pressure for a few trials, but eventually gave in and conformed to the group's wrong answer.