She asked both of us about borrowing your telescope for a week. Which pronoun is a third-person personal pronoun?

The sentence has three pronouns:

-"she"

-"us"

-"your"

the third-person pronoun is "she"; it's in the nominative form. So "she" is also the correct answer to this question!

"us" is first-person accusative or object form and "your" is possessive pronoun of second person