I need a good answer.
Question:
Read the following paragraph that contains a vague pronoun.

My friend and I worked the concession stand at last weekend’s baseball game. He and I quickly sold out of popcorn and hot dogs, but not the peanuts. So it was good. And we were excited to see our players win Their tenth game!

Which underlined pronoun is an example of a vague pronoun?
Options:
A
He

B
it

C
we

D
their