Final answer:
Sodium chloride (A) will be the most conductive solution among the given options due to its ability to dissociate into ions when dissolved in water.
Step-by-step explanation:
The most conductive solution among the given options would be Sodium chloride (A). Sodium chloride dissociates into Na+ and Cl- ions when dissolved in water, making it a strong electrolyte. Acetic acid (B) is a weak electrolyte because it only partially dissociates into ions. Methanol (C) and Dextrose (D) are nonelectrolytes because they do not dissociate into ions. Therefore, the only option that will conduct electricity effectively is Sodium chloride (A).