Fill in the blank with a suitable preposition:
A preposition is a word which comes before a noun or a pronoun and establishes a relationship between the elements of a clause or words. Option B)on is correct as it is used to indicate a covering. The other options are wrong as with, in and off indicate inclusion, a location inside an area, and removal of something respectively. These uses don't fit in the given question. The correct answer is B)on.