who的用法！

Xiaotongdi

Since 1975 so many people have been moving to Utah such that Mormons who were once 75 percent of the population are now only accounting for half of it.

1. so many people have been moving to Utah such that Mormons who were once 75 percent of the population are now only accounting for half of it
   
2. many people have been moving to Utah, so Mormons once 75 percent of the population are now accounting for only half
   
3. that many people have been moving to Utah, such that the Mormons that were once 75 percent of the population are now accounting for only half of it
   
4. many people have been moving to Utah such that the Mormons, who once represented 75 percent of the population, now only account for half
   
5. so many people have been moving to Utah that the Mormons, who once represented 75 percent of the population, now account for only half
   这题答案是E，但是那个who怎么指代的也不是人啊！怎么用呢？B的错误又在哪里？
   

Xiaotongdi

B那里的so不是连词吗？还是说因为前面有since，所以后面不该出现so了？

whopawo

B两个句子没有连词。   the Mormons, 是人。

mlvince

b的话两句话的关系来看应该用so that而不是so？

mlvince

Mormons是摩门教徒吧

Xiaotongdi

who can help me?