Si esta hablando con un "usted" es formal. Como maetros y proffesores. Cuando uses "tu" es familiar. Un ejemplo es con amigos y familia.
Actually the answer is B.
Because nueve is 9 and nueve y cuarenta is 9:40, ocho y treinta is 8:30 which are the hours in the dialogue
Answer:
I could help you if you gave some more detail.
Explanation:
Its tu because tu is formal
