Answer
A) CaCl₂
Step-by-step explanation
In solid form, an ionic compound is not electrically conductive because its ions are unable to flow. However, when an ionic compound is dissolved in water they are capable to conduct electricity because its ions will be able to flow.
Ionic compounds are usually formed between metals and nonmetals.
Hence, the only ionic compound in the option that will most likely conduct electricity when dissolved in water is option A) CaCl₂.