An element is placed in second group and third group ofthe periodic table, bums in presence of oxygen to form a basic oxide. The electronic configuration of the element is

Options

A. `1s^2 2s^2 2p^6 3s^2`
B. `1s^2 2s^2 2p^6 3s^2 3p^6 4s^2`
C. `1s^2 2s^2 2p^6 3s^2 3p^6`
D. `1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^2`