If user demand were the only driving force behind innovation, ..... .
A. the initial stage of stove design would seek to reduce demand
B. the cooking stove wil have been designed in a way to minimize heat transfer
C. the cooking stove would be one of the most sophisticated devices in the world
D. three billion people -nearly half the world's population- would use a stıve everyday
E. research on the development of cooking stoves will be the first priority