This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to wash an rv
Climb onto your roof using a ladder so you can scrub it down.
You can clean your roof the easiest by getting on top of it. Use the ladder attached to your rv if you have one, or set up a ladder next to the back of your rv and climb on top.

Possible answers:
[A]. Be careful when you climb the ladder! Bring your cleaning supplies with you, or have a friend hand them to you after you get on top. Clean with a pre-wash and non-abrasive cleaner if you have a metal rv.;
[B]. Scrub under a hose if you have one. If you have a 10 gallon (355 liter) rv you can use a hose hose attachment on your rv.;
[C]. Check the front and back tires for built up oil (or gunk). Look for any oil leaks, grinds, or rubber deposits on the rear tires.;
[D]. You can use a medium-sized rig to scrub the roof down. If you have a 1000 square foot rv, it may take several tries.;
The answer is:
[A].