Answer:
correct answer is option a(True)
Step-by-step explanation:
Its true that when two liquids which have different densities do not mix with each other that time these two liquids form into layers.
The liquid which have less density float on the surface of more dense liquid.
For example oil and water both have different densities and they do not mix with each other so they form into layer.
Oil floats on surface of water because density of oil is less than the density of water.