Concept:Separation of blood cells from plasma relies on their different densities.
Explanation:Blood cells are denser than plasma.
Spinning the blood sample rapidly creates a strong centrifugal force.
This force pushes the heavier blood cells to the bottom, leaving plasma on top.
Centrifugation is therefore the most suitable method.
Filtration cannot separate cells from plasma effectively because both are fluids or suspended particles with similar physical sizes.
Chromatography is used for separating dissolved substances in a mixture.
Distillation separates liquids based on boiling point differences.
Hence, none of these other methods can separate blood cells from plasma.
Answer:A. Centrifugation