Tranquil is a synonym of calm. So, Calmness is the feeling associated with the word tranquil.
Synonym and uses of synonym:
A synonym is a term, morpheme, or phrase that in a particular language signifies the same as or nearly the same except another word, morpheme, or phrase.
For example, the phrases begin, start, commencement, and initiate are all synonyms in the English language: they are synonymous.
So, option 'C' is the correct answer to the following question.
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