I think it is C, because if I'm right present principal is something that is happening presently? If so, C would be the answer because they "are doing" the exercises right now in context.
Answer:
Most likely a song.
Explanation:
Songs have been used throughout the ages to convey one's love for another. Take "My Heart Will Go On" by Celine Dion from the movie "The Titanic," or "Time After Time" by Cyndi Lauper. Both of these are classic love songs.
The purpose of this piece of text is to inform the reader. I reckon that the source is from the Declaration Of Independence.
