Read the following passage and answer the questions from 116 to 120.
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In the realm of tortious liability, negligence is defined as the breach of a legal duty to care which results in unintended damage to the claimant. The conceptual cornerstone of this doctrine is the "Neighbor Principle," articulated in Donoghue v. Stevenson, which posits that one must take reasonable care to avoid acts or omissions that could reasonably be foreseen to injure those closely and directly affected. However, modern jurisprudence, specifically the Caparo Three-Stage Test, has refined this by requiring three elements: foreseeability of harm, a relationship of proximity, and a determination that imposing liability is fair, just, and reasonable.
Establishing a breach involves an objective standard: the conduct of the "reasonable person." Under the Bolam Test, a professional is not negligent if they act in accordance with a practice accepted as proper by a responsible body of medical or professional opinion. Yet, this is tempered by Bolitho, which allows the court to intervene if that professional opinion lacks a logical basis.
Causation remains the most formidable evidentiary hurdle. The claimant must satisfy the "but-for" test, proving that the harm would not have occurred but for the defendant's breach. In cases involving multiple causes, the court may apply the "material contribution" test. Furthermore, the doctrine of Remoteness, established in The Wagon Mound (No. 1), dictates that a defendant is liable only for the type of harm that was reasonably foreseeable, even if the extent of that harm is exacerbated by the claimant's pre-existing vulnerability, known as the "Eggshell Skull" rule.
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The Caparo test added which specific requirement to the traditional `Neighbor Principle'?