The correct answer to the question is:
b. 18 inches (45.72cm)
Explanation:
1. The statement indicates that each end of a platform must extend over the centerline of its support by a specific distance.
2. The minimum extension required, unless cleated or restrained by hooks or equivalent means, is 18 inches (45.72cm).
3. This extension ensures stability and safety by providing adequate support and overhang beyond the centerline of the platform's support.
Therefore, option b, 18 inches (45.72cm), is the correct minimum extension distance required for each end of a platform.
