Final answer:
A saturated salt solution is the best conductor of electricity due to its high ion concentration, distinguishing it as an electrolyte, unlike distilled water, vinegar, or sugar solutions.
Step-by-step explanation:
The better conductor of electricity among the solutions provided would be a saturated salt solution. This is because it contains a high concentration of ions due to the dissociation of the ionic compound in water.
Such solutions are known as electrolytes and they conduct electricity very well compared to nonelectrolytes. Distilled water, vinegar solution, and sugar solution are not as conductive; particularly, distilled water does not conduct electricity at all since it lacks ions.
Saturated solutions and concentrated solutions differ in terms of the amount of solute that is dissolved. A saturated solution contains the maximum amount of solute that can dissolve at a given temperature, whereas a concentrated solution simply has a large amount of solute relative to the solvent, but may or may not be saturated.