Well, my opinion is that the tortoise actually conforms to a deeper analysis (meaning) and the raging t'storm conforms to a more superficial analysis (structure). But what do I know, I probably didn't even break 170.
OK, I'm going to make one more half-hearted attempt to lobby for my answer -- Job (which I'm really not convinced is right, anyway).
Like you just said - the tortoise conforms to meaning, the t'storm conforms to structure - but the question actually asked, which one conforms to the same
function, didn't it? I specifically remember that word. I also specifically remember that the passage tells us that the author used these Christian symbols to (functionally) critique the majority culture. If cultural critique is the function, only Job could match that, because it is the only religious answer.
I seriously considered the others, because Job seemed too easy, but it's so much of a stretch to liken stone/bread to either a tortoise or a thunderstorm. I just took the easy way out, and I still think there's a chance that it was right. I know that the similar content usually signals a sucker answer, but who's to say they're not just messing with us?
Just my 2 cents.