FIGURE 3-2 -Refer to Figure 3-2. a Shift of the Supply Curve

FIGURE 3-2
-Refer to Figure 3-2. A shift of the supply curve from S to S1 could be caused by

A) an increase in the price of energy-efficient light bulbs.
B) a decrease in the price of energy-efficient light bulbs.
C) an expectation that new government regulations will ban the use of energy -efficient light bulbs.
D) a change in consumersʹ preferences away from ordinary light bulbs toward energy -efficient light bulbs.
E) a decrease in the price of glass, a major input in the production of energy -efficient light bulbs.