Hello Khosro Your question should be 'Are the phrases below correct? or 'Are the phrases below right? And the answer is yes, they are right. The first two are fine. The third one is OK, but we don't usually use the word 'persons' in everyday speech. It would be normal to say 'Which people are your friends?' I hope that helps.

You can say: Which statement is true? What object belongs to you? Who are your friends? or Which individuals do you consider to be your friends?

You could leave 'ones' out of all the sentences if who you're talking to knows what you are talking about. Which are true? Which are yours? and the last one would be better as, Who are your friends?