GWD7 - Q4

Only seven people this century have been killed by the great white shark,  the man-eater of the movies—less than those killed by bee stings.

1. movies—less than those
2. movies—fewer than have been
3. movies, which is less than those
4. movies, a number lower than the people
5. movies, fewer than the ones

我见到了两个不同的答案,B和E. 我倾向于选B. E似乎是比较对象由歧义. 不知道哪位能给讲讲 ?

另外,我想问一下这个波折号的使用方法 ( 比如在做插入成分的标志时 破折号与两个逗号等效么 ? ),不知道之前有没有总结过.

谢谢

Only seven people this century have been killed by the great white shark,  the man-eater of the movies—less than those killed by bee stings.

A.   movies—less than those
            

B.   movies—fewer than have been
            

C.   movies, which is less than those
            

D.  movies, a number lower than the people
            

E.   movies, fewer than the ones

我见到了两个不同的答案,B和E. 我倾向于选B. E似乎是比较对象由歧义. 不知道哪位能给讲讲 ?

另外,我想问一下这个波折号的使用方法 ( 比如在做插入成分的标志时
            破折号与两个逗号等效么 ? ),不知道之前有没有总结过.

谢谢