in mAny CitiEs pEDEstriAns ArE now muCh sAFEr BECAusE ______.
A．no trAFFiC is AllowED on somE strEEts
B．trAFFiC is ComputEr-ControllED
C．CArs movE vEry slowly
D．only onE wAy strEEts ArE opEn to trAFFiC