It can be deduced from the passage that the author ______ the practice of intelligence testing.

A．drive home the meaning of overjustifieation effect
B．prove bad things do happen to good people
C．dissociate one group of "good" people from another
D．show sympathy for people like Billy

A．some so-called good people may not be intrinsically good
B．all good people are intrinsically good
C．some people are more resistant to extrinsic factors
D．some people may be good for the sake of being good itself