Question

greet miguel, a friend and classmate of yours.
— hola, miguel, ¿cómo ________?
— muy bien, gracias.

a. está
b. estás
c. hasta luego
d. tardes

Explanation:

Miguel is a friend/classmate, so informal Spanish address is used. The phrase asks "how are you" informally; "estás" is the informal second-person singular form of the verb estar (to be) for this context. "Está" is formal, "hasta luego" means "see you later", and "tardes" means "afternoons", which do not fit the question.

Answer:

B. estás