Answer:
B. Ladder safety or personal fall arrest systems
Explanation:
Under the provisions of OSHA laws, where the total length of a climb equals or is greater than 24 feet or 7.3 meters, ladders must be equipped with one of the following safety devices.
The safety devices are cautionary provisions to protect a climber should the unexpected happen.To ascend a height of 24 feet and more is exhausting, which poses a risk. The climber may feel dizzy or develop height phobia due to exhaustion.