Answer:
A, the layer at the top of the glass.
Step-by-step explanation:
When liquids of different densities are added to a glass, the liquid with the highest density tends to settle at the bottom and the liquid with the lowest density tends to float to the top of the container.
This is because denser liquids exert more pressure due to gravity, and they are able to push less dense fluids out of their way. - Study island