[求助]as..as 的比較用法

请教一下这个题目

It is as difficult to prevent crimes against property as those that are against
                a person.

a)    those that are against  

b)    those against  

c)    it is against  

d)    preventing those against  

e)    it is to prevent those against  

这个题目看不懂耶~~答案是E 但是不知道为何是E 请大家帮忙解释一下

感激不尽

It is as difficult to prevent crimes against property as
            it is to prevent those(crimes) against a person.

重新组织以下：

to prevent crimes against property is as difficult as to prevent those against a person

原来是这样! 谢谢攸 !! 感恩! ^__^