A scientist is trying to conduct an experiment that requires a strong electrolyte. He has four different compounds in solution, but he is not sure what they are. He runs some tests, and gathers some clues about the properties of each solution. Which solution should he definitely NOT use to perform the experiment?

A. solution 1: conducts electricity well
B. solution 2: is not completely ionized
C. solution 3: is completely dissociated in solution
D. solution 4: is void of carbon or any molecular compounds; seems to be dissociated