Whoever the bookers wanted to.
![Gift Of Jericho......Drink it in, MAAAAAAAAAAAAAN! :jericho :jericho](https://i.imgur.com/Py5fhpi.png)
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But really, how do you have a four way I Quit match? Unless it's an elimination match, who of the other three participants get the victory if someone grabs the mic and says "I Quit?" The loser doesn't necessarily have to be in a submission hold to do so, and it might be the case that they're being put into two different people's submission finishers at once (like Austin being simultaneously caught in the Walls Of Jericho and the Crippler Crossface at King Of The Ring 2001.)
All things considered, it'd likely be Goldberg. Face or heel, he's the only person out of these four that I can't see ever grabbing the mic and giving up.