Which category includes firearms, intoxicating liquors, and certain knives?

The correct category for firearms, intoxicating liquors, and certain knives is classified as prohibited items. This classification indicates that these items are not permitted under certain regulations due to safety concerns and legal restrictions.

Firearms are tightly regulated due to potential misuse and associated risks to public safety. Intoxicating liquors can pose health risks and are subject to strict control in many areas to prevent illegal distribution. Certain knives, especially those deemed dangerous or designed for combat rather than utility, may also fall under prohibitions to ensure safe environments.

The other categories, such as restricted matter, perishables, and hazardous materials, do not accurately reflect the nature of firearms, liquors, and specific knives. Restricted matter involves items that may require permission to transport or possess but are not necessarily banned outright. Perishables refer to items that have a limited shelf life and can spoil, while hazardous materials focus on substances that pose immediate risks to people or the environment, which is different from the legal restrictions applied to firearms and similar items.