In late 1997, the chambers inside the pyramid of the Pharaoh Menkaure at Giza were closed to visitors for cleaning and repair due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing and fungus was growing on the walls.

A. due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing

B. due to moisture that tourists had exhaled, thereby raising its humidity to such levels that salt from the stone would crystallize

C. because tourists were exhaling moisture, which had raised the humidity within them to levels such that salt from the stone would crystallize

D. because of moisture that was exhaled by tourists raising the humidity within them to levels so high as to make the salt from the stone crystallize

E. because moisture exhaled by tourists had raised the humidity within them to such levels that salt from the stone was crystallizing

答案是E， 不理解E 中的them指代，逻辑上应该指代the chambers,但又可指代前面的 tourists，造成指代混乱，但其他选项似乎都不正确....迷惑，请nn帮助

分析一下选项

A. due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing

correctness: which修饰tourist ; such结构误用：such levels that, 没必要再加个so  两个致命错误。不选

B. due to moisture that tourists had exhaled, thereby raising its humidity to such levels that salt from the stone would crystallize

correctness:"注意逗号，thereby raising"表示动作的结果。读起来好像是说因为cleaning和repair导致crystall和fungus

不选

effectiveness: was crystalling改变成would似乎不好。

C. because tourists were exhaling moisture, which had raised the humidity within them to levels such that salt from the stone would crystallize

correctness: such that误用。Correct idiom e.g.: He was such a clever boy that everyone loves him or He was such that everyone loves him不选

D. because of moisture that was exhaled by tourists raising the humidity within them to levels so high as to make the salt from the stone crystallize

我也来补一个:
A. due to后面结构过于复杂; 用which引导非限定性定从不能表达出该有的意思; such…so that固定习语使用错误. its无所指代.
B. due to后面结构过于复杂; thereby raising修饰前面整句，逻辑错误.
C. 用which引导非限定性定从不能表达出该有的意思; such that…短语使用错误; 过去进行的事情不能用过去将来时would.
D. because of后面结构过于复杂. so … as to…使用错误，使得make的行为者成为tourists逻辑错误. that was exhaled没有必要补出that was，累赘.
E. correct. humidity within them...tourists身体里面不可能包含有humidity，所以them不会指代混乱.
open to discuss.