Which document specifically authorizes a person to operate an aircraft in a specific geographic area?

The correct choice is Operations Specifications. This document outlines the parameters under which an operator is authorized to conduct their operations, including specific geographic areas, types of aircraft, and other operational limits. Operations Specifications serve as an integral part of regulatory compliance for air carriers, detailing the scope of their operations and ensuring they adhere to safety and legal standards.

Operating Certificates pertain to the overall authority granted to an airline or operator to conduct air transportation, but they do not define specific operational parameters. Dispatch Release, on the other hand, is a document that provides details for a specific flight, including route, weather, and other factors, but it does not inherently grant authority for operating an aircraft in a geographic area. Instead, it relies on the guidelines established in the Operations Specifications to guide those decisions.