Which of the following in not a good proof to show that Mr. Holland is a good teacher or a good father？

Which of the following in not a good proof to show that Mr. Holland is a good teacher or a good father？
A、His students learn a lot from Mr. Holland.
B、He dreams of composing a symphony that can make him rich and famous.
C、 A lot of students attend his retirement celebration.
D、 He sets a good role model for his son as a good father and a good teacher.
正确答案：He dreams of composing a symphony that can make him rich and famous.