Cómo estás is the best answer since the rest have been answered and said in the dialogue
The answer is (usted) because you dont have a personal relationship with this person.
ustedes means you guys
vosotros means all of us
tu is used for someone whom you are close with like a family member or someone whom you have know for a while.
Simply qué.
The translation: Fernardo told me that you had been shopping. What did you buy? Victor: I bought some jeans and trekking shoes.
"le bebe" is the correct answer
