Maya has a big exam coming up, and she is trying to decide how to prepare.

Explain the nuance (=slight difference in meaning) of obligation between ‘must’ and ‘have to’ in her situation.

A. ‘Must’ conveys a stronger, personal obligation, while ‘have to’ indicates an obligation based on external circumstances.

B. ‘Must’ indicates a suggestion, while ‘have to’ is a command.

C. ‘Must’ is used for past obligations, while ‘have to’ is for future obligations.

D. ‘Must’ and ‘have to’ are interchangeable with no difference.