The correct response is: It is always possible to find a rational number between any two rational numbers.
This is because rational numbers are dense in the real numbers, meaning that between any two rational numbers, no matter how close they are to each other, there exists another rational number. For example, if you have two rational numbers \( a \) and \( b \) where \( a < b \), you can always find a rational number such as \( \frac{a + b}{2} \) (the average of \( a \) and \( b \)) that lies between them.