Concept:An emulsion is a colloid formed by mixing two immiscible liquids, where one liquid is dispersed as tiny droplets in the other.Explanation:In an emulsion, both phases are liquids. Examples include milk (fat droplets in water) and butter (water droplets in fat).Emulsions are usually unstable and separate into layers unless an emulsifying agent is added to stabilize them.Therefore, an emulsion consists of two liquids, not a solid or a gas.Answer:C. two liquids