Answer: Option A
:
A
For any substance to conduct electricity, there must be the availability of mobile charge carriers. These charge carriers can be:
$\bullet$ free electrons that can flow within the substance.
$\bullet$ ions that can flow in the solution.
An acid when added in water dissociates into its corresponding ions. For example, hydrochloric acid (HCl) when added to water, dissociates into ${\text{H}}^{+}$ and ${\text{Cl}}^{-}$ ions. These ions present in the solution conduct electricity.