Which of the following is a negative rational number?

A negative rational number is a rational number that is less than zero. It can be expressed as the ratio of two integers, such as a/b where a and b are integers and b is not equal to zero. It is represented by a negative sign (-) in front of the number. 

A negative rational number has either its numerator or denominator, negative.

Therefore, $\frac{-12}{5}$ is a negative rational number.