Final answer:
The friend is using the peripheral route to influence the decision by relying on positive association with the opinions of others.
Step-by-step explanation:
The friend is using the peripheral route to influence the decision. The peripheral route relies on peripheral cues such as positive emotions and celebrity endorsement to associate positivity with the message. In this case, your friend is trying to convince you to go to the movie by stating that all of your other friends who saw the film claimed it was the best film they had seen in years. This is an example of using positive association with the opinions of others to persuade you to go.