The correct option is A Distillation
Distillation is the method of separation of components of a mixture containing two miscible liquids having significant difference in their boiling point.
For example: The mixture of acetone (b.p. is 560 C) and water (b.p. is 1000 C) is separated using distillation. They form vapours at different temperatures and then these vapours can be condensed separately to obtain pure liquids.