请问一道语法题目

是本月德一道jj题

12. 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 what
                

C)     concerning…
                

D)     regarding

个人认为选C，NN都怎么想啊？

请楼主在标题里面给出题目出处，方便大家回帖，方便后人查询，谢谢啊

各个区的发贴规范：

GMAT机经＋MATH讨论
http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=128922

GMAT语法区版规
http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=79830

GMAT逻辑区格式和搜索
http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=74827

GMAT阅读区-发贴格式和搜索提示
http://forum.chasedream.com/dispbbs.asp?boardID=25&ID=41017

GMAT AWA区版规
http://forum.chasedream.com/dispbbs.asp?boardID=26&ID=107312

方便自己，方便他人，感谢您的理解和支持！