Which of the following factors contribute to the low reactivity of chlorobenzene toward nucleophilic substitution (SN1 or SN2)?

1. AResonance gives the C-Cl bond partial double bond character.
2. BThe C-Cl bond involves an $s{p}^2$ carbon and is shorter and stronger than in an alkyl chloride.
3. CThe phenyl cation that SN1 would need is very unstable.
4. DThe $-I$ effect of chlorine makes the ring carbons electron rich and repels nucleophiles strongly.