Which of the following contains fewer calories

A．one may think that he is too stupid to make the most of his mental faculties
B．a person may have the idea that he is incapable of doing anything
C．a child may accept another person's underestimate of his ability
D．the old people believe that they are able to learn something new

A．confidence and determination
B．purpose and knowledge
C．patience and courage
D．interest and experience