The Figure Above Shows the U

The figure above shows the U.S. production function.
-How would an increase in income taxes be shown in the figure?

A) an upward shift or rotation of the production function
B) a movement from point C to point B
C) a downward shift or rotation of the production function
D) a movement from point A to point B
E) None of the above because the effects of an increase in taxes cannot be shown in the figure.