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