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 question.
I picked up my book. I found that the cover had been torn.
A.Picked up, the book was torn.
B.When picking up my book, the cover had been torn.
C.On picking up my book, I saw that the cover had been torn.
D.The cover had been torn when my book picked up.