Who could be the four of them? Derek 5%, Feminists 5%, Jade 15%, MC 75%
I'd have to put it as Jade 84%, Feminists 1%, Derek 5%, MC 10%.
Quinn needs money, and she thinks the target follows from Sage. Jade is the only one of the potential targets we know has money, so that is clearly best fit for her. None of the targets has an unambiguous connection to Sage, but I think Jade is the best bet here, too.
The MC can have a good connection to Sage, but only if the player chooses to pursue her and this scene happens no matter what. Derek has no clear connection to Sage, and if he were the target Maya would be the obvious next move rather than Sage. The Feminists are barely characters, and we've never seen any sign of Sage knowing any of them.
To date we've never seen any connection between Jade and Sage, but we know Sage has an 'important' family she dislikes, and we know Jade has multiple kids. If Sage is Jade's daughter the connection is obvious.
It's circumstantial evidence, but that's more than the others have.