[QA] You don’t try to work hard. You will fail in the exam.

X. 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:

Question:

You don’t try to work hard. You will fail in the exam.

• A.
  Unless you don’t try to work hard, you will fail in the exam.
• B.
  Unless you try to work hard, you won’t fail in the exam.
• C.
  Unless you try to work hard, you will fail in the exam.
• D.
  Unless do you try to work hard, you will fail in the exam.