Answer:
b. postpurchase cognitive dissonance.
Explanation:
Cognitive dissonance: The term cognitive dissonance is defined as a phenomenon in which an individual's beliefs, behaviors, and ideas contradict or did not match with each other and therefore it creates a state of unease.
Post-purchase cognitive dissonance: The term post-purchase cognitive dissonance is defined as the phrase or context we provide to a particular state of difficulty or unease that exists in an individuals' or customers' mind just after buying or purchasing a particular service or product.