Answer:
A) cognitive dissonance
Step-by-step explanation:
Cognitive dissonance simply put in a laymans word is when beliefs and behaviour disagree.
It can be defined as that feeling of discomfort when your beliefs, ideas, goes contrary to your behaviour or the new information that you are recently exposed to.
Tom who believed that His gadget which was costlier should be better than his friends, finding out that his friend's own, though cheaper but better than his, will start have contrary belief from the new information he is exposed to.