Explanation

(c)
Nucleophile always attacks on electron deficient site. Presence of electron withdrawing groups such as $NO_{2},\ CHO$ etc decreases the electron density on benzene nucleus, hence such groups activate the ring towards nucleophilic attack. While presence of electron releasing groups such as R or OR increases the electron density, thus deactivates the nucleus towards nucleophilic attack.
$NO_{2}$ group activates the ring more than Cl towards nucleophilic attack,
Hence reacts readily with nucleophile.
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