The phrase that best completes this question is los ojos.
Answer:
1. Fui a visitar a mi a abuela para que no se sienta sola
2. El revisor dijo que pagues el billete
3. Me halagó que me hayas mandado tantas flores
4. Le llamé todos los días antes que saliera
Todos los pasajeros llegaban al mismo tiempo
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.
