The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

• A. Full distillation
• B. Cracking
• C. Carbonisation
• D. Fractional distillation

Answer: (D)