I'm not sure what piece you're talking about, maybe you could include a picture of the piece
but in the treble clef the e's are on the bottom line, and top space
if it's flat it'll have a little squished 'b' next to it
a flat e is also a sharp (#) d
A. Understand the concept behind each element and principle of design in the artwork. Because, The It's just a Visual Analysis so my highest guess would got to A since it's the only one that makes Sense when it comes to Visual.
Hope this helps!!
A rainbow!! lol at least i think :/