Final answer:
In a Self-Retracting Lifeline (SRL), the engagement distance is the distance required to trigger the locking mechanism, which stops a worker's fall.
Step-by-step explanation:
The engagement distance in a Self-Retracting Lifeline (SRL) is defined as the distance for triggering the locking mechanism. When a worker falls, the SRL quickly locks to arrest the fall within a short distance. The correct answer to the question is B) The distance for triggering the locking mechanism. This is a critical component of fall protection gear that ensures a worker's safety in the event of a slip or fall from height by engaging the brake mechanism to stop the fall and minimize the risk of injury.