Which brigades are classified as modular support brigades?

Modular support brigades are essential components of the Army's modular force structure, designed to provide flexible and responsive support to combat operations. These brigades include battlefield surveillance, fires, combat aviation, sustainment, and maneuver enhancement brigades. Each of these types of brigades plays a distinct role in enhancing operational effectiveness and enabling joint operations.

Battlefield surveillance brigades are tasked with intelligence gathering and reconnaissance, allowing troop movements to be informed and well-coordinated. Fires brigades facilitate the delivery of responsive artillery and missile support, critical for effective offensive and defensive operations. Combat aviation brigades provide air support, ensuring quick and capable aerial responses to ground engagements. Sustainment brigades ensure that troops are supplied with necessary resources, logistics, and maintenance, which is vital for prolonged operations. Finally, maneuver enhancement brigades focus on assisting in the coordination and execution of combat operations, ensuring that maneuver units can operate effectively across the battlefield.

Understanding the roles and functions of these modular support brigades highlights their importance in modern military operations, making option B the correct choice. The other options, while mentioning various units, do not align with the specific categorization of modular support brigades as defined by the Army's organizational structure.