Outermost electronic configurations of four elements $\mathrm{A},\mathrm{B},\mathrm{C},\mathrm{D}$ are given below:

(A) $3{\mathrm{s}}^2$

(B) $3{\mathrm{s}}^{2}3{\mathrm{p}}^1$

(C) $3{\mathrm{s}}^2 3{\mathrm{p}}^3$

(D) $3{\mathrm{s}}^2 3{\mathrm{p}}^4$

The correct order of first ionisation enthalpy for them is