Fractional distillation of crude oils

What is the separation technique that is used to separate the fractions in crude oil?

• chromatography

• evaporation to dryness

• fractional distillation

• simple distillation

The fractions with the ​ (a)   boiling point condense near the ​ (b)   of the fractionating column.

• highest
• bottom
• lowest

The fractions with smaller molecules have a ​ (a)   boiling point.

Fractions with ​ (b)   molecules have a ​ (c)   boiling point.

• lower
• larger
• higher