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 D1 could be caused by

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