The answer to this question is letter B. It is the y-values.
Usually, y is the dependent variable and x is the independent variable in
graphs and functions. Most of the time, a given function would be expressed as
f(x) =y which means y as a function of x or y depends on the x.
The correct answer among the choices given is option B. It is the y-values that do not describe an independent variable. Usually, in an equation y is dependent to x values which is the independent variable, it is also the domain and the input in an equation.