It is as difficult to prevent crimes against property as those that are against a person.
(A) those that are against a
(B) those against a
(C) it is against a
(D) preventing those against a
(E) it is to prevent those against a
我的理解是
比较对象是
prevent crimes against property和 prevent crimes(those) against a persone
他们之间的难易程度比较
而不是 crimes against property 和 crimes(those) against a persone 不补充prevent 这个动词 是make no sense的