Which method separates two miscible liquids based on their boiling points?

Correct answer: Distillation

The governing concept is separation of a homogeneous liquid mixture by exploiting a difference in boiling points. In distillation, the liquid with the lower boiling point vaporises more readily when the mixture is heated. The vapour is then cooled in a condenser and collected as liquid, while the less volatile component remains behind or distils later. Thus option A, distillation, is correct. Filtration cannot separate miscible liquids because both pass through the filter, magnetic separation requires a magnetic component, and handpicking is useful only for visibly distinct solid pieces.