未有定论机井求教

According to the information provided by police and fire department, the city council proposed to have the alarm system installed given problems during public vehicles accessibility.

A)     during

B)     of the

C)     what

D)     concerning…

E)     regarding

 D，和 E 争论， 到底是D还是E？  given problems ------ public vehicles accessibility 做什么成分？请那位NN指导， 谢谢！