Answer:
B. Personal experience
Explanation:
From the above explanation of the scenario it is clear that the suspicions been raise about Rose's motive is based on the past event that had occurred in recent times.
The personal experience is gathered as a result of event that has happened in the past either good or bad.
Due to the fact that classmates have frequently behaved the same way in the past just for the purpose of helping them study, hence the suspicions is based on personal experience.