In Order to Best Predict Whether People Will Help Another

In order to best predict whether people will help another person,it is best to know something about _______ and _______.

A) their parents' disciplinary practices; their personality.
B) their relationship with the other person; their personality.
C) their personality; the particular situation in question.
D) their past helping behaviours; the costs and rewards of helping.
E) the costs and rewards of helping; the particulars of the situation in question.