What should trigger the creation of an I.O.R?

The creation of an Incident Report (I.O.R) should be triggered by safety, security, or medical issues on the aircraft because these matters involve significant risks that can affect the well-being of passengers and crew members. When such incidents occur, it is crucial to document them meticulously to ensure proper response, preventive measures, and compliance with regulatory and operational protocols.

Recording safety issues highlights the airline's commitment to maintaining high safety standards and enables thorough investigations to prevent future occurrences. Such documentation is essential for improving operational procedures and ensuring that the airline remains compliant with industry regulations and safety guidelines.

Other options, while important, do not encompass the immediate risks associated with safety and security scenarios as comprehensively as option B, making it the correct choice for this context. For instance, while crew scheduling issues and equipment malfunctions are significant, they do not directly jeopardize the safety of individuals in the same way. Similarly, passenger complaints, although important for customer service, do not warrant the creation of an I.O.R unless they escalate into a safety or security concern.