I'd have to say D is the correct one.
'There is some evidence that using mouthwashes does have some clinical benefit in reducing levels of plaque - but only by a bit,' says Professor Damien Walmsley, scientific adviser to the British Dental Association.
They are helpful, they are never going to be a replacement for the mechanical action of a toothbrush for getting teeth and gums clean.'
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Answer: C. cadence
Explanation: ca·dence
/ˈkādns/
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noun
1.
a modulation or inflection of the voice.
"the measured cadences that he employed in the Senate"
synonyms: rhythm, tempo, meter, measure, rise and fall, beat, pulse, rhythmical flow/pattern, swing, lilt, cadency; More
2.
a sequence of notes or chords comprising the close of a musical phrase.
"the final cadences of the Prelude"
The author want the reader to feel terror while reading "The Cask of Amontillado"
