Which Scenario Describes Studying for an Economics Course Without Applying

Which scenario describes studying for an economics course without applying the scarcity principle?

A) Mary studies two hours for every one hour she is in the classroom.
B) Jonah studies three afternoons a week until he understands the material or until dinner,whichever comes first.
C) Lucy studies with her roommate who is also taking the course,and they discuss economic concepts during any free time they can find.
D) Chloe studies for this course and does nothing else.
E) Rafael talks to an economist whenever he has a chance to do so.