Find the synonym of the underlined word

In signal, odour is substituted for sound as a main sort of language.

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Smell

Aroma

Perfume

Awareness

answer is A.

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Detailed Solution

Concept: Smell is correct because in signaling, odour is substituted for sound as a main quiet language, odour means smell.
The aroma is also a synonym for the word odour but this option is inaccurate because it doesn't provide the correct information.
Perfume is also a synonym for the word odour but this option is inaccurate because it doesn't provide the proper information.
The word awareness means knowledge or perception of a situation or fact. Thus, this is an incorrect option as it does not give proper synonyms to the word smell.
Hence, option 1 is the correct answer.

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