A, B and D are correct because facial expressions, eye contact and body posture all contribute significantly to classroom communication and climate. C is false since non-verbal cues like nodding, pausing or moving closer to a learner help regulate turn-taking and attention. E is false because non-verbal messages can reinforce or even contradict spoken words and sometimes affect learners more strongly. Thus, A, B and D only is the correct combination.
Option A:
Option A includes A and B but omits D, missing the influence of posture and movement on classroom climate and authority. Since D is also true, A and B only is not complete.
Option B:
Option B brings together A, B and D, covering facial signals, eye contact and posture as important non-verbal elements, and leaves out the false statements C and E. Therefore, A, B and D only is the correct option.
Option C:
Option C groups B, C and D but includes C, which wrongly claims non-verbal communication plays no regulatory role. By treating C as true, B, C and D only becomes logically inconsistent.
Option D:
Option D selects A, C and D, but C is again incorrect and its inclusion undermines the validity of the combination. Consequently, A, C and D only cannot be accepted.
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