In the Figure Above, an Increase in Z Leads to a

Multiple Choice

In the figure above, an increase in z leads to a

A) leftward shift of the line showing the relationship between x and y.
B) rightward shift of the line showing the relationship between x and y.
C) movement down along one of the lines showing the relationship between x and y.
D) movement up along one of the lines showing the relationship between x and y.
E) trend change in both x and y.