The electronic configuration $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^4$ represents

The number of electrons in each sublevel in each energy level of the ground state atom is represented by the electronic configuration of that atom.

Here, in $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{2}3{\mathrm{d}}^{5}4{\mathrm{s}}^1$ there are four electrons in the outermost shall of sulphur. So it is reactive elements.

Therefore, Option D is the correct answer.