Which greeting is most appropriate in the morning?

What do you usually say when you meet someone for the first time? A. Goodbye B. Hello C. Good night

What should you say when someone says “Hi” to you?

Which greeting is best to use when leaving at night? A. Good afternoon B. Good night C. Good morning

What do you say when you see your friend in the afternoon? A. Good morning B. Good afternoon C. Good night