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.
The correct answer is cascada or salto de agua.
• El salto del ángel es la cascada más alta del mundo.
• El salto del ángel es el salto de agua más alto del mundo.
Lapices , Just remove the “z”
guess what buddy they are all correct :)