I think it’s etching but could be wrong
using optical sound (sound on film)
Answer:
I believe the answer is D. art became the primary way to express one status and wealth
In tonal Western classical music (music with a tonic key or "home key"), the most frequently encountered chords are triads, so called because they consist of three distinct notes: the root note, and intervals of a third and a fifth above the root note. ... A series of chords is called a chord progression
