A. Please invite the guests in.
B. Jenni did not know what the movie was about.
C. I don’t know where Carlos is staying at.
D. Which town are you going to?
Answer:
The sentence that should be revised to eliminate the preposition at the end is:
C. I don’t know where Carlos is staying at.
The revised version would be: “I don’t know where Carlos is staying.”
Explanation: In English grammar, it is generally considered more formal or stylistically preferred to avoid ending a sentence with a preposition. In this case, the preposition “at” at the end of the sentence can be eliminated without changing the meaning or clarity of the sentence.