It is an example of 3. personification.
Personification is a figure of speech where non-human entities are given human abilities or characteristics. So, flowers usually cannot smile (it is something that humans/animals can do), which is why it is a personification. Carpe Diem is the theme of this poem, but not the correct answer here.
I would say:
The past passed very quickly.
Hello, I would love to help but I need more information about how it can help.
