In Louisiana, the 'but-for' test for establishing actual cause in a negligence case asks whether:
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A
The defendant's conduct created an unreasonable risk of harm to the plaintiff class
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B
The defendant's breach was the most significant contributing factor among all causes of the harm
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C
The plaintiff's injury would not have occurred but for the defendant's negligent conduct
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D
The defendant's conduct was a substantial factor in causing harm alongside other independently sufficient causes