The statement that should be true is option c. City P is above sea level and City Q is below sea level.
In terms of math, the number line refer to the straight line where the number should be placed at the equivalent intervals or segment along with the length.
It should be infinitely in any kind of direction and should be presented in the horizontal manner.
Hence, The statement that should be true is option c. City P is above sea level and City Q is below sea level.
Learn more about number here: https://brainly.com/question/24489361