The majority of lightning strikes travel in ? step leaders.

Lightning strikes occur in a series of steps known as step leaders, which are the processes by which the discharge path of a lightning bolt forms. The majority of these step leaders travel in segments of approximately 150 feet. This distance is significant because it provides a measure of how these leaders propagate towards the ground during the initial stages of a lightning strike. Understanding this distance is crucial for lightning protection systems, as it helps in designing effective lightning protection measures and assessing the risks associated with lightning strikes.

The other distances provided in the choices do not accurately reflect the typical behavior of step leaders during an electrical discharge event. Hence, 150 feet represents a generally accepted average for step leader travel, making it the most accurate choice in this context.