Non verbal communication comprises all message cues other than spoken or written words,such as gestures,facial expressions,posture,eye contact and tone of voice. The stem lists gestures,facial expressions and posture specifically,which are classic non verbal behaviours. Therefore non verbal correctly completes the statement.
Option A:
Non verbal cues often reinforce or modify the meaning of verbal messages,for example a smile softening criticism or a frown signalling disapproval. In teaching,students pick up a great deal of information from a teacher's body language. This makes the term non verbal fully appropriate.
Option B:
Oral communication involves spoken words,and while it may include some non verbal elements,its primary focus is on language produced by the voice. The stem emphasises bodily signs rather than speech.
Option C:
Written communication refers to messages encoded in written symbols on paper or screen,which is not what is described here.
Option D:
Mass communication denotes mediated messages to large public audiences and cannot be restricted to the body language used by an individual teacher in a classroom.
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