Which of the following materials is appropriate for flammable and combustible liquids storage?

The appropriate choice for storing flammable and combustible liquids is metal containers. Metal containers are designed to be durable and provide reliable protection against leaks and spills, which is essential for maintaining safety in environments where flammable materials are present. They also have better resistance to physical damage and can handle the varying pressures that might develop within the container.

In addition, metal containers are often used in conjunction with safety standards and regulations that govern the storage of hazardous materials, ensuring that they meet necessary criteria for fire safety. This includes features like grounding capabilities to prevent static discharge, which can ignite vapors.

On the other hand, while plastic containers can be suitable for some liquids, they may not be as reliable under high temperatures or might not meet regulatory standards for all types of flammable liquids. Paper drums and glass bottles are generally not recommended for storage of flammable or combustible liquids due to their susceptibility to breakage and failure under pressure, which can lead to spills and dangerous situations. They do not provide the necessary protection or safety measures required for these types of materials.