Which item is known to require special handling during storage?

The item that requires special handling during storage is all of the materials listed: insect repellent, calcium hypochlorite, and rodenticide. Each of these substances has unique characteristics and potential hazards that necessitate careful storage practices to ensure safety and efficacy.

Insect repellent often contains chemicals that can be harmful if ingested or improperly stored. It should be kept in a cool, dry place away from direct sunlight to maintain its effectiveness and prevent degradation of the active ingredients.

Calcium hypochlorite, a chemical commonly used for disinfection and purification, is highly reactive and can pose serious risks if exposed to moisture or incompatible materials. Proper storage requires sealing it in dry, airtight containers and keeping it in a well-ventilated area to minimize the risk of chemical reactions.

Rodenticides contain toxic compounds that must be managed carefully to prevent accidental poisoning of non-target animals and humans. They should be stored securely, preferably in locked cabinets, to restrict access and reduce the risk of exposure.

Given these requirements for each item, it becomes clear that when considering their storage, all of them necessitate special handling protocols to ensure safety and compliance with regulations. Hence, the choice that encompasses all items is the most accurate response.