Final answer:
The correct response is option C. Sí, voy a tocar el piano.
Step-by-step explanation:
The subject of this question is Spanish. The question is asking if the person is going to play the piano today. The correct response is option C. Sí, voy a tocar el piano. This means 'Yes, I am going to play the piano.' Option A is incorrect because it says the person is going to play the trumpet instead of the piano. Option B is also incorrect because it says the person is not going to play the piano.
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