Three Variables Are Related and Two of Them Are Plotted

Three variables are related and two of them are plotted in a figure.If the variable that is not measured on either the x-axis or the y-axis changes,then there is

A) a movement along the drawn curve.
B) either a shift in the curve or a movement along the curve,but more information is needed to determine which.
C) no impact on the curve because the variable is not measured on either of the axes.
D) a shift in the curve.
E) None of the above answers is correct.