Fill in the blank with the relevant 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 C)to is correct as it is used to express a future action. The other options are wrong as on, with, and in indicate a surface, inclusion, and a position inside an area respectively. These uses don't fit in the given question. The correct answer is C)to.