When the person comes across the unfamiliar words, then he must substitute a synonym. Thus, option (C) is correct.
Synonym refers to those words which has the exactly same meaning or the similar meaning. For instance, the word "Happy" has many synonyms like delightful, joyful, content, blissful, glad, jubilant etc.
In order to know the meaning of the unfamiliar word, the person should replace the word with its synonyms or the words whose meaning are easy to understand and are known to the individual.
The statement can be restated through a synonym, an illustration, or a direct description or definition that is part of a sentence or paragraph.
Therefore, it can be concluded that A synonym must be used in place of the unknown words when they are encountered. Hence, option (C) is correct.
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