After filing your ballot for an election, you are more convinced than you were before filling the ballot that you voted for the best candidate. this example illustrates the idea that when decisions are individuals engage in a greater amount of dissonance reduction

irrevocable

Explanation:

dissonance reduction is the process of removing inconsistency or undesirable factor to get the feeling of comfort and generate positive emotion.

In the psychological research it has been found that when decision are important and cannot be changed once the decision has been made and action has been taken. People try to remove inconsistency and try to validate decision by self affirmation.

In the problem after voting decision cannot be changed one the vote is casted hence it is irrevocable and hence greater dissonance reduction is required.

the answer is       political office  

hope this .