Which movements require a 15-inch step?

The correct choice is based on the requirement that several key movements, specifically half step, left step, right step, and backwards march, are performed with a 15-inch step. Each of these movements involves lateral or backward movement of the feet, which is standardized at that measurement in many marching and military formations.

The half step is characterized by moving one foot forward and maintaining a 15-inch distance, allowing for a controlled and precise marching rhythm. Similarly, the left step and right step are executed using this distance to ensure uniformity and coordination among individuals in formation. The backwards march, essential for retracing steps while maintaining formation, also adheres to the 15-inch guideline to keep movements consistent and organized.

Other options might include movements with different step sizes or specific instructions that don't align with the standardized 15-inch rule. For instance, quick time and right step may not require the same stepping distance as these key movements, leading to a different interpretation of the required measurements. Thus, the importance of the 15-inch step is underscored for accuracy and uniformity in these specific marching movements.