The possible value of l and m for the last electron in the ${\mathrm{Cl}}^{-}$ion are :

Correct option is D)

The valence shell electronic configuration of chloride ion is $3{\mathrm{s}}^{2}3{\mathrm{p}}^6$. The last electron enters $3\mathrm{p}$ atomic orbital. For p orbital,$\mathrm{l}=1$ and $\mathrm{m}=+1, 0$or $-1.$
Hence, the value l and m for the last electron in the chloride ion are 1 and -1.