What is a synchronized combined arms activity under the maneuver commander's control conducted to allow maneuver through an obstacle?

The correct answer is a breach, which is defined as a synchronized combined arms activity that allows maneuver forces to cross an obstacle that has been created or is being defended against. In military operations, a breach is specifically designed to gain access to an area that may be fortified or obstructed, thereby enabling maneuvering units to engage the enemy or reposition themselves strategically.

During a breach operation, coordination between various combat arms, such as infantry, armor, and artillery, is essential to ensure that the obstacle is neutralized and that cover and support are provided to the forces moving through. This can involve suppressing enemy forces, creating gaps in defensive positions, and ensuring that the maneuver elements can exploit these gaps effectively.

In contrast, the other options describe different types of operations. Clearing typically refers to removing enemy forces from an area, an attack is a broader term for offensive operations against an enemy position, and an offense encompasses a wider range of activities aimed at defeating the enemy. Each of these options does not specifically highlight the focus on overcoming an obstacle and facilitating maneuver through a controlled breach as effectively as the correct answer does.