You must start now. Or you will miss the train.

Câu hỏi: Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
You must start now. Or you will miss the train.
A. Unless you start now, you will miss the train.
B. Unless you do not start now, you will not miss the train.
C. If you start now, you will miss the train.
D. You will miss the train because you start now.