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.
I got up late and missed the first class. The alarm clock didn’t go off.
A. If I set the alarm clock well, I would not get up late and miss the first class.
B. Because the alarm clock didn’t working well, I got up late and missed the first class.
C. Because I got up late and missed the first class, the alarm clock didn’t go off.
D. I got up late and missed the first class, so the alarm clock didn’t go off.