Answer:
The correct answer is City D.
Explanation:
When you say the phrase, "closer to sea level" you mean the closest to the very top of the sea, like "0" on a number line.
This means, that whether it is to the left of the right of the number line (or above or below the sea) whichever one has the lowest absolute value is the closest.
Therefore, the correct answer is City D.
Hope this helps! :D