Festinger and Carlsmith (1959) performed a famous experiment on cognitive dissonance in which ...

Festinger and Carlsmith (1959) performed a famous experiment on cognitive dissonance in which subjects were asked to lie to a fellow student (about how fun a psychology experiment was) for either 1 or 20 . For subjects in the 1 condition, dissonance was created because these subjects thought to themselves: I am a nice, ethical person, but I have just been mean and told a lie. It appears that the 1 subjects were ultimately able to reduce this dissonance by thinking to themselves: ____.
 
  a. I did not really tell a lie because the experiment was not that boring. In fact, the more I think about it, the more I think that it was kind of fun
  b. I know I told that person a lie. But so what? There are bigger problems in this world
  c. Lying is a terrible thing. I swear that I will never do it again.
  d. Whatever I got 1 for doing almost nothing Good deal