Which of the following is a Fumigant?

The correct choice, Sulfuryl Fluoride, is classified as a fumigant due to its chemical properties and the way it is used for pest control. Fumigants are volatile substances that can penetrate various materials and environments, providing a method to eliminate pests in enclosed spaces like buildings, containers, and soil. Sulfuryl Fluoride specifically works as a gas that permeates and destroys a wide range of pests, including termites, and is often employed in structural fumigation processes.

The other substances listed, while effective as pest control agents, do not fall into the category of fumigants. Bromadiolone, Warfarin, and Diphacinone are all rodenticides, which function as anticoagulants, leading to internal bleeding in rodents. These compounds are applied differently, typically as bait or in formulations designed to be ingested by pests rather than used in vapor form for widespread gaseous application. Thus, the nature of Sulfuryl Fluoride as a fumigant distinguishes it as the correct answer in the context of this question.