Answer:
I believe the answer is Paragraph 2!
Explanation:
Let me know if this is wrong.
The most common is Chicago style.
The correct answer is metaphor.
A metaphor is a rhetorical figure of speech where two or more things are symbolically compared, without using the words such as like or as (because that would be a simile). This whole poem is symbolical/metaphorical - it talks about the passage of time and how everything is transient and fleeting.