Final answer:
The position responsible for overseeing an AMO's activities is called a QMS - Quality Management System Supervisor.
Step-by-step explanation:
The answer to the question is D. QMS - Quality Management System Supervisor.
An AMO, which stands for Airworthiness Management Organization, is responsible for ensuring the airworthiness of aircraft. As part of this responsibility, an AMO must appoint a person to oversee its activities. This position is called a Quality Management System Supervisor (QMS). The QMS is in charge of ensuring that the AMO's operations and procedures meet the required quality standards.
Other options provided in the question, such as PRM, QAC, and HSE, are not specifically related to the role described in the question. PRM stands for Person Responsible for Maintenance, which is a broader term that can refer to various maintenance activities. QAC stands for Quality Assurance Coordinator and HSE stands for Health, Safety, and Environment Officer, both of which are roles focused on specific areas of responsibility within an organization, but not directly related to the overall supervision of AMO activities.