This is the technique of using your opponents young age to say that he is not qualified.
I think it is c. I remember Reading this story last year in my freshman English class
The correct answer for the given statement above would be option C. A clause used as the object of a preposition is called a noun clause. The object of the preposition will always be a noun. Therefore, the only clause that is also used as the object of a preposition is only the noun clause.