It is correct "... you must wear ..."?

[Jon]

English Grammar Tests, Elementary Level

ESL/EFL Test #50 "Elementary Grammar Questions", question 10

It is a rule: if you ride in my car you ......... wear your seatbelt.

(a) may
(b) might
(c) can
(d) have to

English Grammar Tests, Elementary Level

ESL/EFL Test #50 "Elementary Grammar Questions", answer 10

It is a rule: if you ride in my car you have to wear your seatbelt.

Correct answer: (d) have to
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It is correct "... you must wear ..." ??

Thanks in advance!!

Jon

[Mister Micawber]

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Yes, you could also use 'must' here.
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Native English teacher at Mister Micawber's