Eye contact and sitting posture are related to what?

Correct answer: Non-verbal communication

The direct answer is C: non-verbal communication. Communication is the sharing of meaning. It is not limited to spoken or written words; non-verbal communication sends messages through facial expression, eye contact, posture, gestures, distance and body movement. Step by step: a person sits upright, looks at the speaker and uses an appropriate expression; even without words, these actions can suggest attention, confidence, respect or discomfort; therefore they communicate meaning through the body. Option A, only written work, is wrong because eye contact and posture are physical signals, not writing. Option B, time calculation, has no necessary connection with body language. Option C is correct because eye contact and sitting posture are classic parts of non-verbal communication. Option D, auditing, means checking accounts or records and does not identify these behaviours. Body language should be interpreted carefully because context and culture can affect meaning. Memory cue: if the message comes through the body rather than words, it is non-verbal communication.