Question

Passage:

The maritime doctrine of "general average"—a principle mandating that when cargo is intentionally sacrificed or extraordinary expenditures are incurred to preserve a vessel and its remaining cargo from imminent peril, all participating commercial interests must proportionately share the resulting loss—traces its formal lineage to the ancient Lex Rhodia de iactu (Rhodian Law of Jettison). While early Mediterranean maritime codes, including the eleventh-century Consolat de Mar and the Rules of Oléron, codified specific ritualistic procedures for jettison (such as requiring the master to consult the merchant passengers or senior crew members before casting goods overboard), the conceptual foundation remained strictly restitutionary rather than contractual. That is, the obligation to contribute arose not from an implied covenant among shippers, but from an equitable mandate to prevent the unjust enrichment of those whose property was preserved solely through the deliberate destruction of another's.

In eighteenth-century English jurisprudence, common law courts under Lord Chief Justice William Murray, Lord Mansfield, systematically absorbed these customary maritime practices into the body of commercial common law. Prior to Mansfield's tenure, maritime disputes had fallen largely under the fluctuating jurisdiction of the High Court of Admiralty, which applied civil law traditions derived from Roman digests. Mansfield, recognizing that the procedural delays of Admiralty proceedings hampered London's expanding merchant marine, adapted general average principles to common law actions of assumpsit. However, Mansfield introduced a crucial distinction that altered the evidentiary threshold for contribution. Under classical Rhodian doctrine, the sacrifice was required to be physically violent and immediately catastrophic—such as cutting away a mast during a gale or dumping heavy freight into a surging sea. Mansfield established that extraordinary economic expenditures incurred for the joint safety of ship and cargo—such as port charges and unloading costs incurred when seeking refuge in a port of distress following hull damage—qualified equally for general average adjustment, provided the primary motivation remained the preservation of the venture rather than the mere continuation of the voyage.

This expansion created persistent friction with marine underwriters. Insurers argued that allowing operational expenses incurred in harbor to be categorized as general average blurred the boundary between inherent risks of navigation—which shipowners were contractually bound to bear under standard bills of lading—and extraordinary communal sacrifices. In response, nineteenth-century legal theorists such as Richard Lowndes sought to formalize international uniformity, culminating in the York-Antwerp Rules of 1890. These rules codified the dual requirement that the peril must be real and impending rather than merely speculative, while explicitly exempting customary navigational expenses.

According to the passage, which of the following describes how Lord Mansfield modified the classical doctrine of general average?