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

How to clean cultured marble
Dampen a clean rag with white vinegar.
Your rag should be wet through with white vinegar, but excess vinegar should not drip or seep from the rag. Either pour vinegar onto your rag in a sink or dunk your rag in vinegar in a bucket.

Possible answers:
a). Do not use a wire-handled scrubber, especially with slippery marble. Rather, wipe your rag in circular motions across the surface of your marble.;
b). Wipe the marble with a dry cloth. Rub the back side of the marble gently so that you do not tear the marble or damage the valuable piece.;
c). Only add white vinegar to clean marble if the vinegar does not interact well with the cleaner. White vinegar can be used to clean marble floors, like tables and sofas.;
d). Wring out the rag lightly over a sink. Too much white vinegar can cause this liquid to spread to areas of the marble that are already clean.;
The answer is:
d).