Which of the following compounds has difficulty in breaking $\mathrm{C}-\mathrm{X}$ bond?

In aryl halide, $\mathrm{X}$ atom is attached with $\mathrm{sp}^2(\mathrm{C})$, the $\mathrm{C}-\mathrm{X}$ bond in aryl halide is shorter than in alkyl halides. This makes $\mathrm{C}-\mathrm{X}$ bond stronger in aryl halides. Under normal conditions, halobenzene's are inert to nucleophiles. However, Chlorobenzene can be made to react if the experimental conditions are: 1. High temperature and high pressure. 2. In presence of strong electron-withdrawing $\left(-\mathrm{NO}_2\right)$ substituent at ortho and/or para positions. Thus, $\mathrm{m}-$ nitrochlorobenzene has difficulty in breaking $\mathrm{C}-\mathrm{X}$ bond.