The correct answer is A. Foam.
Espuma is a Spanish word for foam. It is a light, airy substance that is formed when gas bubbles are trapped in a liquid or solid. Foams are often used in products such as shaving cream, whipped cream, and detergent. They can also be used in industrial applications such as fire fighting and oil recovery.
Soap is a substance that is used to clean and remove dirt and oil from surfaces. It is made by combining fats or oils with an alkali, such as sodium hydroxide or potassium hydroxide. Soap molecules have two ends: one end that is attracted to water and one end that is attracted to oil. When soap is added to water, the soap molecules form tiny bubbles called micelles. The oil and dirt are trapped inside the micelles, and they are then rinsed away with water.
Salt is a mineral that is made up of sodium and chloride ions. It is found in seawater and in many rocks. Salt is used in cooking to add flavor to food. It is also used in many industrial processes, such as the production of glass and paper.
Calcium is a mineral that is found in bones and teeth. It is also found in many foods, such as milk, cheese, and leafy green vegetables. Calcium is important for bone health and for muscle contraction.