Allison Buys a New Car

Allison buys a new car.Then she sees the advertisement of another car listing all its benefits and feels confused as to whether she bought the right car.She feels that she should have bought the car advertised in the paper.This is an example of:

A) habitual decision making.
B) internal search for information.
C) postpurchase dissonance.
D) impulse buying.
E) external search for information.