Which statement is NOT true about the idea of switching time？A．U.S. adapted the idea five

Which statement is NOT true about the idea of switching time？

A．U.S. adapted the idea five decades after it was thought out.

B．Thanks to this idea, 1% of electricity was saved in 1970s.

C．It may not be a good idea when various electronics are used.

D．It is a good idea concerning diminishing energy used in lighting.

请帮忙给出正确答案和分析，谢谢！