Peter may/can come with us tonight, but he isn't very sure yet.

[sitifan]

21. Peter ____ come with us tonight, but he isn't very sure yet.
(A) must (B) may (C) can (D) will
[National College Entrance Examination, 1993]
The answer to the above question is option B. Is option C also acceptable to native speakers?

 

[tedmc]

Peter may or may not come; he isn't sure. Peter can come but it doesn't meant he would.

 

[5jj]

Is option C also acceptable to native speakers?

No.

 

[Tarheel]

I would use "might" there, but it isn't one of the choices.