Which of the following when dissolved in deionized water would make a good conducting solution? a)methanolb)sugarc)baking soda

When baking soda is dissolved in deionized water, it can be a good conducting solution.

Explanation:

Methanol and sugar, are organic compound. They are nonelectrolytic.

Baking soda has this formula NaHCO₃ and this is an inorganic salt, which has a very powerful cation to conduce electricity (Na⁺, a metal from group 1)

The equation for baking soda dissociation is this:

NaHCO₃ →  Na⁺  +  HCO₃⁻

As this two are ions, they can make a good ingredient to solution that conduces electricity.