What type of oxidizing agents are included in Class D?

Class D oxidizing agents specifically refer to materials that can ignite flammable metals, such as magnesium, sodium, and potassium. These substances can create dangerous reactions when exposed to heat or moisture and are categorized as dangerous due to their potential to cause significant fire hazards in the presence of water or in particular environments.

In contrast, the other options do not fit within this classification. Liquid fuels are typically classified under flammable liquids, combustibles refer to materials that can catch fire but do not necessarily cause oxidation reactions with metals, and electrical materials are related to electrical equipment rather than chemical reactivity with metals. Therefore, the focus on flammable metals highlights why this category is associated with Class D oxidizing agents.