Which activity requires the use of eye protection?

The selection of "Each of the above" is correct because all listed activities involve potential hazards that could lead to serious eye injuries, thus necessitating the use of eye protection.

Sandblasting produces high-velocity particles that can cause damage to the eyes. During this process, small fragments of sand and other materials are propelled at high speed, creating a significant risk of injury.

Pouring molten metals poses a significant threat as well. The risk of splashes and spatters from the liquid metal can easily injure the eyes, making protective eyewear essential in this environment.

Dust-producing operations typically generate fine particles that can irritate the eyes or result in more severe injuries if the particles are not adequately managed. Eye protection is crucial in preventing such injuries where dust is an issue.

In all these scenarios, wearing appropriate eye protection is vital to safeguarding one’s vision and preventing accidents. Therefore, it's clear why "Each of the above" is the appropriate response, as all mentioned activities require eye protection.