What are composed of carbon, hydrogen, and oxygen and are mostly plant products?

Fats
Carbohydrates
Proteins
Minerals

Carbohydrates

Rationale: Carbohydrates are composed of carbon, hydrogen, and oxygen and are mostly plant products that provide energy. Proteins chemically are composed of carbon, hydrogen, oxygen, and nitrogen, not potassium. Fats are substances that are insoluble in water and are composed of carbon, hydrogen, and oxygen; the common sources are from animals and some plant sources. Minerals are elemental inorganic substances. Vitamins are organic in nature and do not provide energy; however, they act as catalysts for efficient metabolism.