You can play computer games. Make sure you stop at 1 p.m

A. You can play computer games in case you don’t stop at 1 p.m.

B. You can play computer games provided you fail to stop at 1 p.m.

C. You can’t play computer games unless you promise to stop at 1 p.m.

D. You can’t play computer games if you promise to stop at 1 p.m.