Answer:
AVAILABILITY
Explanation:
the blank will be filled with AVAILABILITY.
when your roommate asks you about dating Chris and she asked about him that he is a considerate person or not. And you tell her that he is a considerate person by you judgment that he lent you the book is the case of the Availability heuristic.
The availability heuristic is a method of making a judgement by immediate example which comes into his mind.