heilongh

A: such levels so that.... 不对，应该是 such .. that ... or so... that.  先铲除。
B: salt would... and fungus was .... 不平行，铲除。
C: them比较歧义，似乎也可以理解为指代上面紧挨的句子的主语 - 游客。同时salt would... and fungus was .... 不平行，铲除。
D: because of 加上一句超级长，超级拗口的名词，肯定不对。同时salt would... and fungus was .... 不平行，铲除。
E：好像都说的过去。because 后面是个moisture had raised the humidity的 主干，没问题。后面salt and fungus也平行。
我会选择 E.