Which of the following reactant will show inertness to nucleophilic substitution reaction ?

${\mathrm{S}}_{{\mathrm{N}}^1}\text{ and }{\mathrm{S}}_{{\mathrm{N}}^2}$ not possible in the following.
 

Stearically crowded reaction center for ${\mathrm{S}}_{{\mathrm{N}}^2}$ Bridgehead ${\mathrm{C}}^{\oplus }{\mathrm{sp}}^2$ hybridized not possible (Bredt's rule). Hence ${\mathrm{S}}_{{\mathrm{N}}^1}$ and ${\mathrm{S}}_{{\mathrm{N}}^2}$ not possible.

Lone pair of Br in resonance with Benzene ring. Hence partial double bond character. No ${\mathrm{S}}_{{\mathrm{N}}^1}$ or ${\mathrm{S}}_{{\mathrm{N}}^2}$ possible.
 

not stable. Hence ${\mathrm{S}}_{{\mathrm{N}}^1}$ not possible stearic crowded for backside attack. Hence ${\mathrm{S}}_{{\mathrm{N}}^2}$ not possible.