Answer:
<u>Los que</u> hablan con los clientes son los meseros.
The correct answer is aquella, because we would use the word if there was a difference in the distance. Like if you were in the right corner of a room, and the guitar was at the left corner of the room. And another reason is because aquella is feminine and in spanish, guitar is feminine.
Elena PIENSA estudiar enfermería.
Elena plans to study medicine.
<span>Decidió is the word that fills the sentence.
There you go.</span>