[deleted because poster did not cite author]

E?

Please don't forget to cite the author - we can't host questions that have not given proper copyright attribution.

The Question is awful. Cleaning and Repair ...I don't think they are parallel.

Anyway I think answer is B.

Saurabh Malpani

I will change answer to E

First of all, the question is: "due to" or "because"? Note that due to is an adjectival phrase (adjectives modify nouns/pronouns) whereas because is an adverbial phrase (modifies verbs). What is due to modifying? It's not very apparent from the sentence but (to me) it looks like it's the need for "cleaning and repair". So, if I were to paraphrase, it would be - "the chambers.. were closed to visitors for cleaning and repair, required (due to / because)...". So, due to seems to be linking the the verb "to need" to the reasons cited by the latter phrase. Therefore, you can't use due to here.

I'm not very good at differentiating between verbs and nouns, so I use a general tip (apparently, correct 99% times), which is to look out for a "to be" verb immediately preceding the linking phrase to judge whether it should be "due to" or "because". Examples (correct): They were defeated because of their poor form. The defeat was due to their poor form.

A and B are thus incorrect.

D is incorrect because (not due to) a) 'raising' incorrectly modifies tourists and not moisture, and b) "them" doesn't have a clear referent.

E is incorrect because "was crystallizing" doesn't sound idiomatic to me.

That leaves C. I'm not 100% sure if "such that x would y" is correct idiom but it sounds better than "was crystallizing".

BTW, I noticed that there are other flaws as well in A and B:

A: 'which', incorrectly modifies tourists. its has no clear referent, and lastly, the stone was crystallizing isn't idiomatic.
B: 'had exhaled' is past perfect, implying that a group of tourists had exhaled moisture, which in particular rose humidity :)

As Stacey posted earlier, Please don't forget to cite the author - we can't host questions that have not given proper copyright attribution.

Thanks all!

in E "them" is unclear - good be the tourists, right?

The original question was deleted because the poster did not cite the question's source.