单选题 According to the passage, which statement is NOT true?

A、 A child may accept another person's underestimate of his ability.
B、 He may think that he is too young to make the most of his mental faculties.
C、 A person may have the idea that he is incapable of doing good work.
D、 Some old people don't believe that they are capable of learning anything new.

【正确答案】 B

【答案解析】解析：参见第一段中的“he does not understand how to make the most of his mental faculties”。