When verbs are conjugated in the present tense they have these changes in the root, therefore it is important to identify the person, the number and gender in each sentence to conjugate them correctly and that they have agreement with what is being expressed.
the answer will be "tú eres de Miami" because "eres" means are, so it will be like saying you are from Miami. To use "estás" makes no sense since it would be like saying you are Miami.
