Walking is too slow.___ you take a car,or you will be late.A.IfB.UnlessC.WhenD.BecauseAccording to the meaning of the sentence,it seems i should choose B.But can "Unless" and "Or" get together?

Walking is too slow.___ you take a car,or you will be late.A.IfB.UnlessC.WhenD.BecauseAccording to the meaning of the sentence,it seems i should choose B.But can "Unless" and "Or" get together?
Walking is too slow.___ you take a car,or you will be late.
A.If
B.Unless
C.When
D.Because
According to the meaning of the sentence,it seems i should choose B.
But can "Unless" and "Or" get together?

Walking is too slow.___ you take a car,or you will be late.A.IfB.UnlessC.WhenD.BecauseAccording to the meaning of the sentence,it seems i should choose B.But can "Unless" and "Or" get together?
B(条件状语从句,‘除非你坐汽车,否则你会迟到的’,是的"Unless" and "Or" can get together

the answer is B
the OR is mean 要不然。
走路太慢了，除非你驾车，要不然你将会迟到。
or 在这里的意思是“要不然”