The correct answer is D. Carbohydrate.
Cellulose is a polysaccharide, a type of carbohydrate. It is the most abundant organic compound on Earth, and it is the main structural component of plant cell walls. Cellulose is made up of long chains of glucose molecules, and it is not digestible by humans. However, it is an important source of fiber for animals.
Minerals are inorganic substances that are essential for life. They are found in the Earth’s crust, and they are absorbed by plants and animals from the soil or water. Minerals are important for many bodily functions, including bone growth, muscle contraction, and nerve function.
Proteins are organic compounds that are made up of amino acids. They are essential for life, and they are found in all living things. Proteins are involved in many bodily functions, including building and repairing tissues, making enzymes, and transporting molecules.
Fats are a type of lipid, which is a type of organic compound that is insoluble in water. Fats are made up of fatty acids, and they are an important source of energy for the body. Fats are also important for the absorption of vitamins A, D, E, and K.