Not as far as I can tell. The phrasing of the question test does not acknowledge such ambiguity to start with, and by forcing them to answer one way or the other the test does not allow the users to signal perceived ambiguity even if they wanted to.

So how could the point of this exercise possibly be to find the range of ambiguity?

No, it assumes there's a singular point where it is ambiguous, whereas I'm saying it's a range within which it's ambiguous.