Marnie attends very closely to the english teacher's lecture because she knows she must pass her english course in order to graduate. marnie's attentiveness demonstrates the effect of

Marnie's attentiveness demonstrates the effect of: personal significance

Personal significance is an incentive for someone to do something because the fear of losing either honor, exclusion or to experience humiliation.

The feat to lose the privilege to advance to the higher class make influence marnie to pay attention to the class