pls help!!
In 2021, the united states 4,119.85 billion kilowatt hours (kWh) of energy. If there are 3600 kilojoules (kJ) in a kilowatt hour, how much total energy, in exajoules (EJ), was generated by the united states in 2021?
(a) 14.8 EJ
(b) 1.48 x 10^3 EJ
(c) 1.48 x 10^10 EJ
(d) 1.48 x 10^16 EJ