The boy pleaded that he had not stolen the book.
The Options given are
The boy said "I don't steal the book".
The boy said "I didn't steal the book".
The boy said "I haven't stolen the book".
The boy said "I hadn't stolen the book".
I am aware of that the simple past, past perfect and present perfect in direct speech change into the past perfect in reported speech, if the reporting verb is in the past tense. So, here it seems that second, third and fourth options can be correct answers.
But a book(by a non native speaker) says only third option is right. Is it right? Could you explain to me what the correct answer is?