When Dominic Went into the Chocolate Shop with His Friend

Multiple Choice

When Dominic went into the chocolate shop with his friend, he was given a free sample by an old lady behind the counter. According to the norm of reciprocity, what will Dominic most likely do before he leaves the store?

A) Walk out empty handed because it was his friend who wanted to buy candy, not him.
B) Purchase some candy.
C) Purchase some candy, but only if the old lady was friendly to him.
D) Purchase some candy, but only if he is hungry.