The correct answer is:
An ionic bond is likely because they are metals and will want to bond with nonmetals.
Group 2 elements, which are alkaline earth metals, have two valence electrons. These metals tend to lose their two valence electrons to achieve a stable electron configuration, typically resembling that of the nearest noble gas. When they lose these electrons, they can form positively charged ions (cations) and will often bond with nonmetals that can gain those electrons, resulting in ionic bonds.