Me choose the 2nd answerthere are 2 questions

I think you are right to pick sad as the dominant theme. She is not angry. She is nostalgic thinking back on even the outside smalls that were like a perfume to her. So C is right.

You might think about A as your other choice. The silent flute (shared love of music) suggests that. The last stanza is the very core of what she wishes were still true and what she remembers as being best in their relationship. I'd pick A.

Question Two

The last one E is as close as any. Lyrics are usually told in the first person and this one does that. The emotions are first person. The rhyme is simple (also a lyric characteristic). I'd pick E.