Answer:
i like kpop so you should too, If not thats ok, but hope you have some good food!
The main plot is about a man and woman falling in love. However, if you go deeper in the story it's basically showing how the "American dream" or any dream is unattainable. During this time, the 1920's, people went against their morals such as Jay Gatsby and did what they could to become successful. But as much as they tried they still were unhappy. Like how Jay was wealthy and successful but just wanted to be with his love Daisy. He ended up unhappy because his true dream was short-lived. Hope that wasn't too confusing.
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!