Aye, it could be. Or it could be that they want us to choose it, for some reason of their own.

[But why? Is it a clue to finding who they need to or is it a trap? He glances over at the Doctor, thoughtfully. Not all his memories are back, but there's enough of them now that he can recall those times where they'd find themselves in some unknown place, not knowing what would happen next. And it's that that prompts his answer.]

You walk over to the door labeled 'B'. If there's a terrible beastie lurking on the other side, well...you can't say as you'll be entirely surprised.

Let's go find out what's this way, then.