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 D)after is correct as it means following in order. The other options are wrong as for, with, and since indicate a purpose, inclusion, and a duration with a given starting point of time respectively. These uses don't fit in the given question. The correct answer is D)after.