Read the following conversation and answer the question.

M: What do you think you'll be doing in five years' time, Carrie?

W: I definitely won't be working as a car park attendant. I want to become an opera singer. I hope I'll be living in Milan. What about you, Frank?

M: Unless I pass my exams, I'll probably serve rude customers in the restaurant.

W: Come on. Don't be so sad. Cheer up, Frank.

Question: Why is Frank so sad about his future planning? 

- Because he wants to be a singer but he cannot.

- Because he won't be able to live in Milan.

- Because he is afraid that he cannot pass the examination.


Because he is afraid that he cannot pass the examination.