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)from is correct as it is used to indicate a cause. The other options are wrong as of is used to express possession, for indicates a purpose, and as is used to describe a purpose. These uses don't fit in the given question. The correct answer is B)from.