C: A musical argument appeals almost entirely to the listener's emotions.
Explanation:
When we listen to music, and enjoy it, it is because it appeals to our emotions. Music does not present any ethical or logical arguments. On the other hand, when we read an essay, we usually encounter a larger variety of arguments, including <em>logos</em> and <em>ethos</em>. This is the main difference between an argument presented by a piece of music and an argument made in an essay.