The use of electricity in the US in 1902 was 6.03 x 10^9 killwatt-hours. The use of electricity in the US in 1950 was 4.3 x 10^11 kilowatt-hours. How many times more was the eletricity used in 1950 than 1902? Express your answer in scientific notation. A- 1.73 x 10^2 B 10.33 x 10^20 C 2.6 x 10^20 D 7.131 x 10