The word that most adequately fill in the blank would be:
C). Pervasive
The word 'pervasive' communicates that 'something that is able to impact everything around.'
In the given passage, this would be the correct word to fill the blank as it implies that the cold wind was spread throughout the place which was affecting them from the inside out.
The other options do not go with the context of the passage and fail to comprehend its meaning.
Thus, option C is the correct answer.
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