The correct option is D Fractional distillation.
Simple distillation can be used for separating liquids having sufficient difference in their boiling points.
If the boiling points of the liquids to be separated are closer to each other, then fractional distillation is carried out using the fractionating column.
Examples of fractional distillation:
1. Distillation of petroleum, coal tar, and crude oil
2. Methanol (B.P. = 65°C) and Propanone (B.P. = 57°C)
3. Benzene (B.P. = 80°C) and Toluene (B.P. = 110°C)
Chromatography technique is not used to separate liquids having closer boiling points.