Final answer:
Sodium chloride (NaCl) is the strong electrolyte among the given substances.
Step-by-step explanation:
In this question, we are asked to identify which one of the given substances can be classified as a strong electrolyte. A strong electrolyte is a substance that completely dissociates into ions when dissolved in water, resulting in a solution that can conduct electricity well. Sodium chloride (NaCl) is a strong electrolyte because it completely dissociates into sodium ions (Na+) and chloride ions (Cl-) when dissolved in water. Therefore, the correct answer is Sodium chloride (NaCl).