The answer is D. Incidental music
Serious, cynical, and even grim.
Answer: Hyperbole
"With love's light wings did I o'erperch these walls" is an example of a hyperbole. Hyperbole is among the many figures of speech in which it refers to the exaggeration of some scenes with the aim of spreading humor and fun.
You will worry less about highlights in areas. What will be worried about is the overall compostion of the piece.