(Figure: Understanding Phillips Curve Shifts) the Graph Shows Two Phillips

Multiple Choice

(Figure: Understanding Phillips Curve Shifts) The graph shows two Phillips curves. Suppose the economy originally faced curve PC₁. Which of these would cause the curve to shift to PC₂?

A) Workers in the economy are expecting lower inflation.
B) The natural rate of unemployment rose.
C) The nonaccelerating inflation rate of unemployment increased.
D) The actual unemployment rate fell.