I think the answer is C but that’s just a guess
B - Down. Just try and see if it makes sense to be in the sentence
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"During the shop’s peak hours – from eight in the evening till around midnight – one could hardly hear oneself talk because of the boisterous chatters that went on."
Answer: Hearing
Explanation: The phrase is talking about voice, which is something that can be heard. Touch, smell and sight are not used in the phrase.
Hope this helps :)