When Two Variables in a Graph Are Related to a Third

Multiple Choice

When two variables in a graph are related to a third, changing the third causes

A) either a shift or a movement in the curve but more information is needed to determine which occurs.
B) a movement along the curve.
C) no change in the curve because the third variable isn't on the axes.
D) a shift of the curve.
E) None of the above answers is correct.