Question

-¿Quién

- usando el baño?
- Pienso que es tu hermana.
(A) me
(B) se
(C) está
(D) estás

Answer 1

The answer for this question is c because esta translates to is and that is what you are looking for

Answer 2

Im pretty sure the answer you are looking for is C. esta

Step-by-step explanation: