Physical barriers are caused by environmental conditions or structural obstacles that interfere with message reception. A pillar blocking the view of the board is a clear structural obstacle. It prevents students from seeing visual information even though the message itself is clear. Thus this is a physical barrier.
Option A:
Physical barriers also include poor lighting or noise,and all relate to tangible conditions in the environment,matching the example,making option A correct.
Option B:
Semantic barriers arise from problems in word meaning or language use,not from blocked sightlines.
Option C:
Psychological barriers involve emotions or attitudes such as fear or prejudice,which are not mentioned in the stem.
Option D:
Organisational barriers stem from hierarchical structures and procedures,rather than seating arrangements in a single classroom.
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