Which of the following is a proper handling instruction for Category A substances?

The correct answer emphasizes the importance of safety and compliance when handling Category A substances. These are materials that pose significant risks during transportation, which is why they must be packaged in approved containers. Such containers are designed to withstand potential leaks or breaches that could occur during transport, thus preventing exposure to hazardous materials.

Packaging in approved containers ensures that these dangerous goods are contained securely, minimizing the risk of accidents and exposure to people and the environment. Approved containers are also subject to regulations that consider the physical and chemical properties of the substances they hold, making them crucial for safe transport.

Other options present practices that do not align with safety protocols. Transporting without protective measures or in a non-secure environment increases the likelihood of incidents. Similarly, failing to label these substances would create serious safety risks, as critical information regarding the hazards would not be communicated to those involved in the transport process. Proper labeling is essential to ensure that anyone handling or coming into contact with the goods is aware of the potential dangers.