Answer: Option (c) is the correct answer.
Step-by-step explanation:
When there is transfer of electrons from one atom to another then it results in the formation of ionic bond.
This bond formation takes place between a metal and a non-metal.
Mg being a cation has excess of electrons and Cl being an anion has deficiency of electrons. Therefore, in order to attain stability there will be transfer of electrons between Mg and Cl.
Thus, out of the given options Mg and Cl will form an ionic bond