What argument do you want us to research about
O A
Explanation:
If you know what people like you it will be easy for you to use the topic instud of trying to figure out what people like you would know .
Third person plural pronoun is THEY.
If you want to create a possessive pronoun out of that one, that would be THEIRS.
Possessive pronouns, as the name itself says, determine some kind of possession. For example:
Is this books yours? - No, it's theirs.
A: a source that’s cited in another source