The National Unity Day is celebrated in India on the birth anniversary of ________.

The correct answer is C, Sardar Vallabhbhai Patel. National Unity Day, or Rashtriya Ekta Diwas, is observed on 31 October, the birth anniversary of Sardar Patel, who was born in 1875 at Nadiad, Gujarat. The day was started in 2014 to honour his role as the first Deputy Prime Minister and Home Minister who brought more than 560 princely states into the Indian Union, earning him the title Iron Man of India. It is marked with a Run for Unity and a unity pledge, and on 31 October 2018 the 182-metre Statue of Unity was unveiled in his memory at Kevadia on the Narmada. A is wrong because Dr Ambedkar's birth anniversary, 14 April, is Ambedkar Jayanti. B is wrong because Indira Gandhi's birthday, 19 November, is observed as National Integration Day. D is wrong because Mother Teresa was born on 26 August, which is not a national day. Exam tip: 31 October means Sardar Patel, National Unity Day and the Statue of Unity.