Answer:
Ellas talking about a group of girls
El talking about a boy
Nosotros talking about myself and my friends
Yo talking about myself
Tu talking directly to my best friend?
I would say A because if she is suprised that he only says dear than it would more than have to be A
Answer:
You can used this website that i used to conjugate all your words
Explanation:
https://www.spanishdict.com/conjugate/ir