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.
The book is very interesting. My brother bought it yesterday.
A.The book which my brother bought it yesterday is very interesting.
B.The book my brother bought yesterday is not interesting.
C.The book which is very interesting my brother bought yesterday.
D.The book which my brother bought yesterday is very interesting.