The ordinary ensemble symphony comprises of four gatherings of related melodic instruments called the woodwinds, metal, percussion, and strings violin, viola, cello and twofold bass.The principle floor of the auditorium is known as the Orchestra. This can get confounding in case you're setting off to an ensemble show and your seat is in the Orchestra. That doesn't imply that you'll be situated in front of an audience with an instrument in your grasp! In a few scenes this region is known as the Stalls. Overhangs.
I do hear this a lot, so don't blame me for being wrong (even if I'm wrong). I would say this answer (d), because I think what D is saying is that they would mix a certain amount of colors to make "their color", (as an artist) so that is their "medium". Hope this helped!!