You can go out. Make sure you come back before 9 p.m.

A. You can go out provided that you come back before 9 p.m.

B. You can’t go out if you come back before 9 p.m.

C. You can’t go out in case you forget to come back before 9 p.m.

D. You can go out unless you come back before 9 p.m.