When I had a private chat with her, I found ________________________________ (她的一些评论非常有说服力).

A．He bas learned a lot from his own mistakes.
B．He is quite experienced in training wild dogs.
C．He finds reward more effective than punishment.
D．He thinks it important to master basic training skills.

A．have descended from a dozen or so ancestors
B．are smaller than the African lions
C．do not have enough to cat
D．are physically weaker than the African lions