The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous $\mathrm{NaOH}$ is:

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The intermediate formed in aromatic nucleophilic substitution reaction is carbanion. Carbanion stabilised by electron withdrawing groups. Aryl halides are less reactive towards nucleophilic aromatic substitution with aqueous $\mathrm{NaOH}$. Introduction of electron releasing group like ${\mathrm{OCH}}_3$ group further decreases its reactivity towards nucleophilic substitution. But the introduction of electron withdrawing groups like ${\mathrm{NO}}_2$ group particularly at the ortho and para position increases its reactivity towards nucleophilic substitution. Higher the number of electron withdrawing groups, higher the reactivity.
$\therefore$ The correct reactivity order is