Carla Was Thinking About Buying a New Car, So She

Carla was thinking about buying a new car, so she asked a co-worker, Barbara, about her new Honda CRV. She wanted to know more about the car and was wondering if paying the extra money for the navigation system was worth it. Barbara told her how much she liked her CRV and all the benefits of having the system and said it was definitely worth the cost. Carla bought a CRV with the navigation system after talking to Barbara. Which type of reference group influence had an impact on Carla's purchase?

A) product influence
B) informational influence
C) primary influence
D) informal influence
E) utilitarian influence