The answer is: [B]: accident chain .
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Note:
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Answer choice "A: accident sequence" ; refers to: 1) an unplanned event—or sequence of events— that results in undesirable consequences; or to: 2) an incident with specific safety consequences or impacts.
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Answer choice: "C: accident reduction" ; refer to prevention measures.
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Answer choice: "D: none of the above" ; is incorrect; because "Answer choice: B: accident chain" ; is the correct answer.
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