A. Distillation. If the mixtures have different boiling points, the liquid with the lower boiling point will distill off first, followed by the other one.
“B. Filtration” is incorrect. Both liquids will pass through the filter paper.
“C. Sedimentation” is incorrect because it works only for a solid suspended in a liquid.
“D. Evaporation” is incorrect. Both liquids will pass into the atmosphere never to be seen again.