急求一道语法题。。又是代词，。。我的软肋啊。。

凌晨果果

As Charles Darwin observed, natural selection operates whenever individuals of one genetic composition are better at reproducing than that of others.

1. that of others
   
2. the other
   
3. another
   
4. those of another
   
5. that of the next
   答案选D，请求牛人帮忙解释下~~~万分感谢~~
   

凌晨果果

those对应individuals
others 指other genetic composition

-- by 会员 kking (2010/9/24 13:39:58)

万分感谢~

kking

those对应individuals
others 指other genetic composition