“ El muchacho” would be the best choice because it is asking a question and “mañana, dia, and hola” all have a past tense sort if deal to them.
It depends if you they like the party’s or not but since s it’s in ellos(them) form it would be this:
no,no les gustan las fiestas
no they do not like party’s ^
si,les gustan los fiestas
yes,they do like party’s ^
Everyone that will leave an answer will just use Google translate, so I advice you to do the same.