I cannot be sure, because we have no context. However, from what I understand, the first sentence is an example of a transition sentence for your second body paragraph. It basically is saying that people hide their emotions and feelings.
The prompt is telling you to explain why people would do so.
Since the prompt is to write about why people choose to hide their true emotions, maybe you can first elaborate on <em>what</em> these people are feeling (if you are doing this on a specific topic) and how it's possible they don't want to show their feelings in fear of feeling exposed and vulnerable. Perhaps people don't show others what they're feeling because it's a privilege they aren't ready to share with certain people.
This is really about your interpretation, so it's important that you use what you know about humans and logic. I just gave an example, but you will have to write more on it and explain it in detail if you choose to use it.
D: their
This makes more sense than his. There is more than one person being referred to in the sentence. the word solo is referring to Joe and Daune.
I tried putting his in the sentence and it just doesn't make sense to me. If the sentence was like the following: Joe was not nervous about___his __ solo in the concert then I think it would make more sense to use this word.
Hopefully this helps and good luck. :)
P.S. Don't you mean: Neither Joe nor Daune were nervous about __their __ solo in the concert? Were makes more sense than was.
It helps proves that your claim or thesis is credible.
Answer:
I think it's explain because he asked him to answer him

Who can you infer transformed Dryope into a tree?
A. the country people
B. her child
C. Iole
D. Lotus

D. Lotus
HOPE THIS HELPS^^