Verbal communication refers to messages that rely on words,either spoken or written,as the main carriers of meaning. Both speech and text are based on language systems with vocabulary and grammar. The stem clearly mentions spoken or written words,which is the defining feature of verbal communication. Therefore,"verbal" correctly completes the statement.
Option A:
Non verbal communication includes gestures,facial expressions and other cues that do not rely on words. While important,these are different from the word based focus described in the stem. Hence this option does not match.
Option B:
Verbal communication includes classroom lectures,discussions,letters and emails,all of which use language as their primary code. Because the stem emphasises spoken or written words,this option precisely fits the description.
Option C:
Visual communication focuses on images,symbols and graphics even when no words are used. It may accompany verbal messages but is not the same as word based communication.
Option D:
Mechanical communication would refer to technical transmission systems and is not a standard label for word based interaction.
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