A shift of the supply curve from S to Upper S 2S2 could be caused by A.a decrease in average income that enforces consumers to buy less expensive energy dash efficient light bulbs. nothing a decrease in average income that enforces consumers to buy less expensive energy dash efficient light bulbs.a decrease in average income that enforces consumers to buy less expensive energy-efficient light bulbs. nothing B. a decrease in the price of? energy-efficient light bulbs. C.increasing government subsidies to suppliers of energy dash efficient light bulbs. increasing government subsidies to suppliers of energy dash efficient light bulbs.increasing government subsidies to suppliers of energy-efficient light bulbs. D. an increase in the price of? energy-efficient light bulbs. E.an expectation that new government regulations will ban the use of energy dash efficient light bulbs. an expectation that new government regulations will ban the use of energy dash efficient light bulbs.an expectation that new government regulations will ban the use of energy-efficient light bulbs.