PFV AJUDEMA modal is a verb that combines with another verb to indicate mood or tense. A modal (also known as a modal auxiliary) expresses necessity, uncertainty, ability, or permission.
Most linguists agree that there are 10 core or central modals in English: can, could, may, might, must, ought, shall, should, will, and would. Other verbs--including need, had better and may also function as modals (or semi-modals).

The sentence that corresponds with the right correlation with the modal verb is:

A)
Doctor: “You’re seriously ill. You must get some rest and follow the treatment.”

B)
Don´t panic. You can change the time

C)
He is lousy. He had better do nothing

D)
Student: “And that is why, Professor John, I think you mustn´t reconsider this grade.”

E)
You shouldn´t study if you want to get a good grade