Which of the following cannot be used for lifting?

The choice indicating that chain cannot be used for lifting is incorrect, as chain is in fact a widely recognized and suitable lifting medium in various industrial applications. Chains offer high strength and durability, which makes them ideal for lifting heavy loads securely when used with the appropriate lifting equipment such as hoists and cranes. They resist wear and can handle the environmental stressors typically present on job sites.

Nylon slings and wire ropes are also commonly used for lifting. Nylon slings are flexible, lightweight, and capable of lifting delicate loads without damaging them, while wire ropes provide the necessary strength and resistance to stretching which is crucial during lifting operations.

Selecting "all are suitable for lifting" would be a more accurate choice, recognizing that each of these materials has its own applications based on load type, conditions, and safety requirements. Understanding the characteristics of each lifting medium is essential for safe and effective hoisting practices.