Estude! Com Prof. Caju

In which alternative is the idea expressed by the modal verb INCORRECTLY stated in brackets?

A) In China, there might be 10 million teenage internet addicts. (Possibility)
B) It must be hard for him to work and study at the same time. (Obligation)
C) You mustn't park here or you'll receive a fine. (Prohibition)
D) Could you lend me your book for a week? (Request)
E If you're getting fat you should go on a diet. (Advice)

It must be hard for him to work and study at the same time. = Deve ser difícil para ele trabalhar e estudar ao mesmo tempo.
Must, neste caso, tem valor de possibilidade.