Question

I know you finished reading his book, which is about Jamestown.

Answer 1

Answer:

his

Explanation:

Third-person pronouns are substitutes of nouns that refer to people or things other than the speaker or listener. They can be singular like “he,” “him,” “his,” “she,” “her,” “hers,” “it” and “its” or plural such as “they,” “them,” “their,” and “theirs.” In the sentence, then, there is only one third-person pronoun: his.

Answer 2

His a third-person personal pronoun, because it;s talking about someone else other than your/his/her self