Final answer:
Nora's affection towards the bus driver is a result of a)the mere exposure effect, a phenomenon where people grow fonder of things due to familiarity.
Step-by-step explanation:
Nora's reaction best illustrates the mere exposure effect. This psychological phenomenon occurs when individuals develop a preference for things simply because they are familiar with them. In Nora's case, after three months of regular interactions, her affection for the once gruff and scowling bus driver has grown, likely because she's become accustomed to seeing him and possibly started to understand his behavior in a more nuanced way. This contrasts with other concepts like the bystander effect, where witnesses are less likely to help someone in distress when others are present, or the reciprocity norm, which involves responding to a positive action with another positive action. Furthermore, mirror-image perceptions relate to reciprocal views of each other often held by parties in conflict, such as two groups having similar thoughts about each other.