If ${\mathrm{\Delta }}_0<\mathrm{P},$ the correct electronic configuration for ${\mathrm{d}}^4$ system will be

For weak field ligand ${∆}_0<\mathrm{P}$ 

For going electron into e_g level electron require an energy equal to ${∆}_0$

For pairing electron in the t_2g  level electron require an energy equal to P

Depending on the availabilty of energy electron will pair up in t_2g or occupy e_g

Since ${∆}_0<\mathrm{P}$, electron will go to e_g level.

Electronic configuration is ${\mathrm{t}}_{2\mathrm{g}}^3{\mathrm{e}}_{\mathrm{g}}^1$