Assume the Market Is in Equilibrium in the Graph Shown

Assume the market is in equilibrium in the graph shown at demand D and supply S1. If the supply curve shifts to S2, and a new equilibrium is reached, equilibrium quantity will increase from 4 to 4.5 units. Which of the following is true?

A) Producer surplus increases by $3.00.
B) Producer surplus decreases by $8.50.
C) Producer surplus increases by $7.50.
D) Producer surplus decreases by $16.