In Column 1 are the names of some great Indians,whose birthdays are celebrated as special days, which are given in Column 2.Match the birthday with the day of celebration

Engineer's day is observed on 15th September that's the birthday of M. Visvesvaraya. 

Sadbhavana Diwas is celebrated on the 20th of August every year to commemorate the birth anniversary of the erstwhile Prime Minister of India, Shri Rajiv Gandhi. Sadbhavana in English means Goodwill and Harmony. Thus when translated, the day is Harmony Day for India. 

Doctor's Day in India was established by the Government of India in 1991 to be recognized and celebrated every year on 1st of July as National Doctors day. It is celebrated on 1st of July on the birth and death anniversary of the most famous physician of India Dr. Bidhan Chandra Roy (Dr. B C Roy).

National Youth Day is celebrated in India on 12 January on the birthday of Swami Vivekananda. Hence, option C is the correct answer.