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. To achieve a stable electron configuration, they tend to lose these two electrons, resulting in the formation of positive ions (cations). When they lose their valence electrons, they can bond with nonmetals that are looking to gain electrons, typically forming ionic bonds.