FCC chairman decided to update the technology mainly becauseA．the NG911 system can help mo

FCC chairman decided to update the technology mainly because

A．the NG911 system can help more people.

B．talking on phone has become out of date.

C．telecommunications technology is developing.

D．trapped students could not text 911.

请帮忙给出正确答案和分析，谢谢！