Answer:
D. The liquids are allowed to separate into layers.
Step-by-step explanation:
Density refers to the weight of the substance. The substance which is light in weight remains at the top of the substance which is heavy or with more density. This principle is used for separation of liquid based on their density.
In the process, the liquid sample composed of various liquids of varying density is poured in a separating funnel. The setup is left as it is without disturbance for considerable period of time. Based upon the weight of the liquid it forms a layer in which liquid with high density settles at the bottom, whereas liquid with less density remain at the top.