Eye contact, posture and facial expressions are classic elements of body language, i.e., non-verbal communication used to regulate interaction and convey emotion.
Option A:
Written communication uses text/notes, not facial expressions and posture.
Option B:
Mass communication refers to media-to-large-audience communication, not face-to-face cues.
Option C:
Non-verbal communication includes gestures, posture, facial expressions and eye contact—exactly the examples given.
Option D:
Mechanical communication is not a standard category for body language cues.
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