It’s a fragment . To make it a complete sentence say “On the other side of the room, there is a voting booth.”
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Because the question is asking for a sentence that would help the main idea, you would need to look for a sentence that supports the idea of the Death Valley being a fascinating place.
Therefore, "Death Valley has been the setting of countless movies and novels." Is the best answer choice.
It uses not only but also which is a word pair
