A, because this was an inspiring song
The correct answer is a short story.
Your options are tragedy, short story, lyric poem, and expository essay. The answer cannot be tragedy because tragedy relies of dialogues and emotions rather than narration. It cannot be a lyric poem because it is solely about emotions. An expository essay is just telling you how to do something - or how something is achieved.
We are left with a short story - it uses narration to tell us what is going on and it describes people and their experiences.
One could have many interpretations, such as a peace sign, people think hippies, equality, tranquility; however, with a personal symbol there is a more sentimental attachment, involving experience, trauma, or memories