“Well, well, well… Look who it is! Ms. ‘I’m going to blow you up just to spit you!’ Happy to see us again?” Orb A says.
“Just get on with it already.” The mare says groaning.
“Why in such a hurry? Well fine then, try this one out for size!” Orb C says.
The orbs have a new puzzle for you! One of them contains the key, and here is what they have to say for themselves.
A: “I don’t got the key, mate.”
B: “Hmm? Yeah, I have the key. Open me up and check!”
C: “Seriously though, A doesn’t have the key.”
D: “B doesn’t have the key, I swear on me mum.”
You know the one who has the key is lying. Which one has the key?
You are right, I’ll edit the post to reflect that.
I did. That’s how I know that the author left out a line.
This is the quest in its original form, you can check the archive to see for yourself.
Otherwise there are three possibilities about which lie and which tell the truth, and no way to narrow which has the key down.
Edited