Rifka: We do not need to stop and ask for directions. We would not need to do that unless, of course, we were lost. Craig: The fact that we are lost is precisely why we need to stop. In the exchange above, the function of Craig's comment is to ["provide a counterexample to Rifka's generalization", "affirm the truth of the stated premise of Rifka's argument while remaining noncommittal about its conclusion", "contradict the conclusion of Rifka's argument without offering any reason to reject any of Rifka's implicit premises", "deny one of Rifka's implicit premises and thereby arrive at a different conclusion"]