The phrase that best completes this question is los ojos.
Answer:
A) Carlos vio un mono aullador. Era grande pero tranquilo y le gustó ver a la gente.
Explanation:
Tuve esa pregunta
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.
B: se venden
Meaning they sell