Fill in the blanks with suitable prepositions:
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/in is correct as on and in are used to indicate a connection and that something is a part of the other respectively. The other options are wrong as of, at, and with indicate possession, a specific location and inclusion respectively. These uses don't fit in the given question. The correct answer is B)on/ in.