The most appropriate response is:
An ionic bond is likely because they will want to give away two valence electrons in order to become stable.
This is because Group 2 elements, also known as alkaline earth metals, tend to lose their two valence electrons to achieve a stable electron configuration, typically resembling that of the nearest noble gas. This loss of electrons allows them to form cations, which can bond with nonmetals that tend to gain electrons, resulting in ionic bonds.