I think it is A: It makes clear to the reader that the narrator is making an ironic statement.
Answer: I’m pretty sure that’s your opinion lol
A: prefix - beginning
B: root - middle
C: suffix - end
The participle in this sentence is D. Singing. Participles are formed by turning a verb into an adjective to modify another word. Therefore, singing here is a verb and is also modifying the word group.