Soru: Combine the two sentences using a defining relative clause: "This is the book. I told you about it."
A) This is the book which I told you about.
B) This is the book about I told you.
C) This is the book whom I told you about.
D) This is the book who I told you about.
Çözüm: The correct answer is A) This is the book which I told you about. 'Which' is used to refer to things in defining relative clauses, providing essential information about the noun.
