Correct option is B
- National Unity Day, also known as Rashtriya Ekta Diwas, is celebrated on 31 October to honor the birth anniversary of Sardar Vallabhbhai Patel.
- He played a significant role in the integration of India post-independence and is often referred to as the "Iron Man of India." The day is celebrated to promote national unity and integrity.
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- Sardar Patel was a key leader in India's struggle for independence and the country's first Deputy Prime Minister and Home Minister.
- His efforts were crucial in uniting the princely states with India.
- The Statue of Unity, the world's tallest statue, is dedicated to Sardar Patel, located in Gujarat, his home state.