Step 1: Understanding National Consumers’ Day.
National Consumers’ Day is observed in India to spread awareness about consumer rights and responsibilities.
Step 2: Historical background.
On 24 December 1986, the Consumer Protection Act was passed in India. To commemorate this, National Consumers’ Day is celebrated every year on 24 December.
Step 3: Analysis of the options.
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(A) 15 March: This is World Consumer Rights Day.
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(B) 24 March: Incorrect.
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(C) 15 December: Incorrect.
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(D) 24 December: Correct.
Step 4: Conclusion.
Hence, National Consumers’ Day is celebrated on 24 December.
Final Answer:} 24 December.