Which method of distillation would you recommend for a mixture with components that have boiling points 5°C apart, and why?

Fractional distillation, because it is more cost-effective for all mixtures.

Simple distillation, because it is faster and uses less energy.

Simple distillation, because simple distillation and fractional distillation would both achieve the same purity.

Fractional distillation, because it achieves higher purity for close boiling points.