You just have to expand the sentence and you will know whether ‘tourists or chambers’ is logical.
Because moisture exhaled by tourists had risen the humidity within
them to such levels that salt from the stone was crystallizing.
Expanded;
Because moisture exhaled by tourists had raised the humidity within (them)
tourists to such levels that salt from the stone was crystallizing.
Now this means that ‘moisture was ‘
exhaled within’ tourists, and that exhalation was to such levels that salt from stones was crystallizing. What logic is
‘tourists exhaling within tourists’? So “
them” should unambiguously refer to
chambersGMAT SC is about form as well as meaning
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