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 didn’t know that you were at home. I didn’t visit you
A. If I knew that you were at home, I would visit you
B. If I had known that you were at home, I would have visited you
C. If I knew that you had been at home, I would have visited you
D. If I would know that you were at home, I visited you