Question

i said to him,"who wrote this book?" narration change​

Answer 1

Here is the correct answer:

I asked him who had written that book.

Explanation:

It was an interrogative case.  The reporting verb 'said to' is changed into 'asked', enquired' or 'wanted to know'.When we convert an interrogative sentence starting with wh- word, we don’t add any conjunction such as ‘that’, ‘if’ etc. We just use the wh-word and turn the question into statement. The other tense and pronoun changes are applied as per the reported speech rules.