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.
Political ads and campaigns put a lot of money into their ads and the people who make them put a lot of thought into how the symbols, music and photos in those ads could affect your emotions. The whole point of the ad is to list the other atrocities of the other runner and put yourself in a better light. This leads the viewer to either sympathize or support the focal point of the campaign.
