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.
The preposition in the given sentence is in.
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What are Prepositions?</h3>
To indicate direction, time, place, location, spatial relationships, or to introduce an object, a preposition is a word or set of words used before a noun, pronoun, or noun phrase. Prepositions typically appear before a noun or pronoun, providing a relationship between nouns, pronouns, and other components of the phrase. Examples of prepositions include the words "in," "at," "on," "of," and "to." Prepositions, which are frequently brief words that denote direction or place, must be remembered to be understood. Simple prepositions are brief words that we place before nouns or pronouns to show how those words relate to the noun in question. The two basic categories of simple prepositions are time and place.
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The answer is A. stressed unstressed stressed unstressed stressed unstressed stressed it allows you to visualize the speaker.