I believe the answer is a stage whisper. A stage whisper is defined as “a loud whisper uttered by an actor on stage, intended to be heard by the audience but supposedly unheard by other characters in the play.”
The only conjunction in this sentence is C) but.
All of the other options are prepositions, not conjunctions.
Answer:
The theme of this poem is that sometimes it is better for someone you love to forget you and be happy than it is for them to remember you and be sad.
Did you read Harry Potter when you were on holiday?