FIGURE 3- 1 -Refer to Figure 3- 1. a Shift of the Demand

FIGURE 3- 1
-Refer to Figure 3- 1. A shift of the demand curve for energy- efficient light bulbs from D to D2 could be caused by

A) an increase in the price of ordinary light bulbs.
B) a change in preferences away from ordinary bulbs to energy- efficient bulbs.
C) a news bulletin stating that energy- efficient light bulbs emit a harmful gas.
D) a decrease in the price of energy- efficient light bulbs.
E) an expectation that new government regulation will require the use of energy- efficient light bulbs only.