Which of the following is primarily involved in managing aviation and ground sustainment operations for the aviation brigade?

The correct answer highlights the critical role of Aviation Support Battalions (ASB) in managing aviation and ground sustainment operations for an aviation brigade. ASBs are specifically designed to provide comprehensive support, which includes maintenance, logistics, and essential services necessary for the effective functioning of aviation units. They ensure that aviation operations are sustained through coordinated logistics, supply chain management, and equipment readiness, which is vital for mission success.

While other areas such as maintenance operations and supply chain management are important in the overall functioning of military operations, they fall under the broader responsibilities of the ASB. Maintenance operations focus primarily on equipment upkeep and support, while supply chain management deals with the logistics of getting the necessary supplies to the point of use. Signal operations pertain to communications and information systems, playing a significant role in operational coordination but not directly in aviation and ground sustainment operations. Therefore, recognizing the ASB's all-encompassing role in ensuring that both aviation and ground support functions seamlessly is key to understanding why this answer is the most appropriate.