21: According to Bem's self-perception theory, participants in the $1 and
  $20 experiment who told a lie for $1 changed their attitudes more than
  participants who told a lie fo $20 because the participants

   B: inferred that they must have liked the task because they said they
    did for so little money

Correct.  According to Bem's self-perception theory, we have no special access to our own attitudes.  Therefore, we look at our own behavior the way an objective observer might.  If we said we liked the task for so little money, we must really have liked it.
 


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