The correct answer is D. disinfectant.
Potassium permanganate (KMnO4) is a strong oxidizing agent that can be used to disinfect surfaces and water. It is also used in some industrial processes, such as the production of paper and textiles.
Insecticides are chemicals that are used to kill insects. They can be used to control pests in agriculture, homes, and businesses.
Fertilizers are substances that are added to soil to improve plant growth. They can be organic or inorganic, and they provide plants with essential nutrients such as nitrogen, phosphorus, and potassium.
Pesticides are chemicals that are used to kill pests, which can include insects, rodents, weeds, and fungi. They can be used in agriculture, homes, and businesses.
Potassium permanganate is not an insecticide, fertilizer, or pesticide. It is a disinfectant.