You know, I'm rather glad to infer that it isn't just me who's very hesitant about multiple choice answers on tests like this due to overthinking them :) There are several on the practice site I was using which had answers that weren't mutually exclusive to my mind, even though they were intended to be.

When I think about it, eighteen inches isn't even a challenge for parking - that's absolutely miles. Anything more and you haven't even parked, you've just sort of stopped.