Which species can conduct an electric current?

The correct answer is this one: "d. HCl (aq)." The species that can conduct an electric current is HCl (aq). Hydrochloric acid is considered as a conductor of an electric current because it's an acid and in aqueous state. Conductivity won't work in solid based on the given choices.

Here are the choices

a. NaOH (s)

b. CH3OH (aq)

c. H2O (s)

d. HCl (aq)