Помогите!!!! Choose the grammatically correct variant: а) You can’t get a cash prize unless you get good results in your tests. б) You can get a cash prize unless you get good results in your tests. в) You didn’t get a cash pri...

Помогите!!!! Choose the grammatically correct variant: а) You can’t get a cash prize unless you get good results in your tests. б) You can get a cash prize unless you get good results in your tests. в) You didn’t get a cash prize unless you didn’t get good results in your tests. г) You haven’t got a cash prize unless you get good results in your tests.