The correct answer is (b). Oils are liquid fats. They are a type of lipid, which is a molecule that is made up of carbon, hydrogen, and oxygen. Lipids are insoluble in water, but they are soluble in organic solvents. Oils are typically found in plants and animals, and they are used in a variety of products, including cooking oil, cosmetics, and lubricants.
Phospholipids are a type of lipid that is found in cell membranes. They are made up of two fatty acids, a phosphate group, and a nitrogen-containing base. Phospholipids are important for the structure and function of cell membranes.
Steroids are a type of lipid that is found in the body. They are made up of four rings of carbon atoms. Steroids are important for a variety of bodily functions, including the production of hormones, the regulation of metabolism, and the maintenance of immune function.
Therefore, the correct answer is (b). Oils are liquid fats.