I'm not a cop but I've been helping someone study using similar questions.
First off, if you knew he was intoxicated he shouldn't have been allowed near the car, something should've been done before he even got a chance to put the key in the ignition. Instead of advising him not to drive you could've been contacting someone for help at that point.
He needs to be relieved from duty, his gun confiscated and he should be sent home (not allowed to drive, he should be taken home). Counseling for his problems should be recommended after speaking with him and determining if this is a one time thing or an on going problem with substance abuse and any other appropriate disciplinary action should be taken.
The interesting part of THIS question is it's not a subordinate, it's your supervisor (Sgt). I would guess the answer would be to contact via radio or whatever you guys do, the Sgt's superior on the shift (captain?). It's probably that person's responsibility to handle the above actions. (you might try reaching in and removing the key from the ignition and tossing it in the bushes or something but then again from what some of these guys have said he might have 10 sets of back up keys).. LOL... oh you probably need to fill out a few reports too (but I wouldn't know about that).
If he did try to drive off he's committing a crime in your presense and you might need to arrest him or give him a sobriety test !! That should keep him busy until backup arrives, which shouldn't be long since I'm guessing you're still at the station.
Where is Sgt Dave when you need a good answer, he's good at these test questions !!!
I hope you scored well !!! Good Luck...
