What are the three marching steps used in drill?

The three marching steps used in drill are indeed the 15-inch step, the 30-inch step, and double time at 180 steps per minute. The 15-inch step is commonly utilized during certain ceremonies and when performing close order drill, as it allows for precision and control in tight formations. The 30-inch step is the standard length used in most marching situations, providing a balance between execution speed and control. Double time, which involves a rapid pace of 180 steps per minute, is utilized for situations where speed is necessary, such as during tactical movements or when responding to urgent scenarios.

The other options contain variations of marching steps that deviate from the standard understood by drill commands. For example, other choices either mention incorrect step measurements or introduce informal terms that do not align with the military's structured marching commands. Focusing on the standard marching steps outlined in Option B is vital for successful participation in military ceremonies and drills.