Which of the following represents the group state electron configuration for the Mn³⁺ ion
A. 1s²2s²2p⁶3s²3p⁶3d⁴
B. 1s²2s²2p⁶3s²3p⁶3d⁵4s²
C. 1s²2s²2p⁶3s²3p⁶3d²4s²
D. 1s²2s²2p⁶3s²3p⁶3d⁶4s²