Defensiveness is a psychological state in which a person feels threatened and protects self-image by resisting or avoiding messages. If a student interprets comments as personal attacks,they become defensive and stop listening,blocking communication. This matches the barrier described in the stem.
Option A:
Redundancy usually aids understanding; it is not a barrier in itself.
Option B:
Mechanical failure refers to technical problems such as faulty speakers,which are not involved here.
Option C:
Semantic clarity would reduce misunderstanding,whereas the issue here is emotional reaction,not word meaning.
Option D:
Defensiveness often leads to selective listening and distorted perception,making option A the accurate label.
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