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

English Grammar Tests, Elementary Level

ESL/EFL Test #50 [color=blue]“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 [color=blue]“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
[size=200]_________________________[/size]

It is correct “… you must wear …” ??

Thanks in advance!!

Jon

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Yes, you could also use ‘must’ here.
.

But I think might is also the correct answer, as my knowledge that “Have to” and “migh” are same meaning in positive sentences.
Can you explain to me ??

No, your knowledge is confused: ‘have to’ is necessity and ‘might’ is possibility.

yeb “Mister Micawber”
I’m confused between might and must. Thank for your remind :smiley: