Well i know the greeks and romans used black backgrounds for their vases but i dont know if that is what you are looking for
Answer:
how about ace a witch who is going around the forest exploring she runs into many different creatures and people and she goes to many adventures around the world.
shes a very kind, helpfull, and strong witch who can cast any spell and do anything. she even helps other people on their journeys.
Explanation:
im not very good with characters but i tried hope you like it a bit atleast -w-
1) plagal
2) this can be debated everywhere because it depends on what "makes sense" I think it is a phrase but it could just as easily be a measure. a period would be too long and a cadence, while making sense, is a cadence, it ends a phrase. The answer the answer key is looking for will probs be a phrase.
3) phrases, period (answer D)
4) A: Authentic
hope his helps! good luck with the rest of Music Theory!