Answer: The correct answer is Option A.
Step-by-step explanation:
Ionic bond is formed when there is complete transfer of electrons from one element to another element. The element which donates the electrons is known as electropositive element and the element which accepts the electrons is known as electronegative element.
After loosing electrons the electropositive element forms cation (positively charge species) and after gaining these electrons, the electronegative element forms anions (negatively charges species)
Charged species are considered as unstable species and hence they combine to form an ionic bond which is stable in nature.
Therefore, the correct answer is Option A.