(Figure: Interpreting Supply Shifts 3) When the Supply Shifts from S₀

(Figure: Interpreting Supply Shifts 3) When the supply shifts from S₀ to S₁, the equilibrium quantity changes from

A) $60 to $40.
B) $40 to $60.
C) 20 units to 15 units.
D) 15 units to 20 units.