GIFT MINI CASE: Winston Needs to Buy His Girlfriend, Vanessa

GIFT MINI CASE: Winston needs to buy his girlfriend, Vanessa, a gift for her birthday.He knows she will expect the "perfect" gift.He feels like boyfriends are "supposed" to get their girlfriends jewelry or perfume.His older sister recommends a necklace or earrings. While he's at the jewelry store, he also buys a watch for himself, rationalizing that he hardly ever buys stuff for himself and he "deserves it."
-In the GIFT MINI CASE,Winston's perception of what he is "supposed" to get Vanessa is the result of ________.

A) psychological field
B) evaluation of alternatives
C) prepurchase search
D) sociocultural inputs
E) need recognition