The correct answer is: B. Baba Amte
Baba Amte was an Indian social activist who worked for the upliftment of the poor and marginalized, especially those with leprosy. He was awarded the Indira Gandhi Award for National Integration in 2003.
Shyam Benegal is an Indian filmmaker who is known for his social realist films. He has not won the Indira Gandhi Award for National Integration.
Acharya Mahaprajna was an Indian monk and social activist who worked for the upliftment of the poor and marginalized. He has not won the Indira Gandhi Award for National Integration.
Mrinal Sen was an Indian filmmaker who is known for his political films. He has not won the Indira Gandhi Award for National Integration.
The Indira Gandhi Award for National Integration is an Indian award given to individuals or organizations that have made significant contributions to national integration. The award was instituted in 1985 by the Government of India in memory of Indira Gandhi, the former Prime Minister of India. The award is given annually to one individual or organization.