Which WC law extends to land-based employees who load and unload seagoing vessels?

The Longshore and Harbor Workers Compensation Act is the appropriate choice because this federal law specifically provides coverage for maritime workers, including those involved in the loading and unloading of seagoing vessels. It is designed to protect dock workers and other related employees, ensuring they receive compensation for work-related injuries or illnesses that occur on navigable waters or adjoining areas, such as piers and loading docks.

The other options do not cover the same scope: the State Workers' Compensation Act applies to employees within the state’s jurisdiction, typically covering land-based activities and not maritime workers specifically. The Merchant Marine Act primarily deals with the rights and responsibilities of merchant marine officers and seamen but does not focus specifically on workers loading or unloading vessels. The Jones Act pertains mainly to maritime shipping and seamen’s rights when injured at sea, rather than longshore workers engaged in port operations. Therefore, the Longshore and Harbor Workers Compensation Act is the correct answer for employees loading and unloading seagoing vessels.