The elements found in the Group 1, or the Alkali Metal Group, have electronic configurations that end in [tex] s^{1} [/tex].This means that they have 1 electron readily available to release in order to achieve a stable state.
When these atoms release the valence electron, they will achieve a stable state. For example, Lithium's stable state will be [tex] Li^{+} [/tex] and Sodium will be [tex] Na^{+} [/tex].
The oxidation state will then be +1.
The answer is C.
