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Out of these all option C is more stablised as -OCH3 group stablises the carbocation by its + mesomeric effect .As,
while in A ,-Cl destabilize by -I and in B, -NO2 destabilize by -I and -M both.
Option C is correct
while in A ,-Cl destabilize by -I and in B, -NO2 destabilize by -I and -M both.
Option C is correct