There is much--can be done about the accidents--from careles

从问题上看,只要看arising 就可以确定答案.
Accidents arise from careless.arising from careless用拉修饰accident.
There is much that can be done.是省略结构,应为much+(thing)+that,也就是that can be done用来修饰thing.如果没有much,which 和that基本都可以用,但是有特殊词形容主词时,只能用that,不能用which.