Question

which of these will best separate a saltwater solution?
using a paper filtering system
using chromatography
allowing the salt to settle
allowing the water to evaporate

Explanation:

Paper filtering is for separating solids from liquids where the solid particles are large - salt ions in saltwater are too small. Chromatography is for separating mixtures based on different affinities for stationary and mobile phases, not ideal for salt - water separation. Salt in saltwater is dissolved and won't settle out on its own. Evaporation of water leaves behind the salt, effectively separating the salt - water solution.

Answer:

allowing the water to evaporate