B me ducho is the correct answer
The answer is A. Tú tocas el piano. Because Tu tocas is the only correct way of saying you are playing the piano in this instance. C is saying "tocan" which is wrong because it's saying you but then using a the group form of playing. The same thing with B, it's also using the group form of playing and it's past tense. And D is using the I form of playing not the you form.
Answer: These could be some possible answers:
1. ¿Dónde estaba Miguel cuando (yo) llamé por teléfono? Estaba en la cocina. Lavaba los platos.
2. ¿Dónde estabas (tú) cuando Juan Carlos y yo fuimos al cine? Estaba en casa. Leía una revista.
3. ¿Dónde estaba tu hermano cuando empezó a llover? Estaba en la calle. Paseaba en bicicleta.
4. ¿Dónde estaban ustedes cuando Felipe vino a casa? Estábamos en el estadio. Jugábamos al fútbol.
Explanation: Just to elaborate a little on the answer, it can be added that in this exercise you have been asked to write questions and answers using the correct form of the verbs. Specifically, you need to conjugate the verbs in pretérito imperfecto and pretérito perfecto simple. The former indicates that an action was taking place at the same time as another action in the past (estaba, paseaba, lavaba), whereas the latter indicates that an action took place before the moment when we are talking (fuimos, vino).
Estaba corriendo it’s past tense
