FIGURE 3-1 Refer to Figure 3-1

FIGURE 3-1 Refer to Figure 3-1.A shift of the demand curve for energy-efficient light bulbs from D to D¹ could be caused by

A) a decrease in the price of ordinary light bulbs.
B) a news bulletin stating that energy-efficient light bulbs emit a harmful gas.
C) a decrease in the price of energy-efficient light bulbs.
D) an expectation that government regulation will soon prohibit the use of ordinary light bulbs.
E) a change in preferences toward ordinary light bulbs.