Answer:
C. Post purchase behavior
Explanation:
Whenever a consumer buys a product, he/she undergoes various stages between the creation of need/want and the ultimate purchase decision.
5 stages have been stated under Consumer buying decision, namely,
In the given case, the customer already bought both the wines. Her opinion regarding superiority of quality and taste between the two, represents her post buying stage of purchase decision and her review of the viability of purchase decision.