Atomic number of Mn is 25 what is the electronic configuration in the ground state________________?

• A. 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁷
• B. 1s² 2s² 2p6 3s² 3p⁶ 4s² 4p⁵
• C. 1s² 2s² 2p⁶ 3s² 3p⁵ 3d10
• D. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²3d⁵