The correct answer is Subhash Chandra Bose .

The title ‘Father of the Nation’ is often used to refer to Mahatma Gandhi in India, but it is important to note that this title has no official status and was not conferred on him by the government.

There is no clear consensus on who was the first person to use the title ‘Father of the Nation’ for Gandhi, and it is likely that the term was used by various people at different times. However, one of the most widely recognized instances of the title being used was by the Indian leader Subhas Chandra Bose, who is the answer to option 4.

Bose was a prominent Indian nationalist who played an important role in the Indian independence movement. He was a contemporary of Gandhi and shared many of his ideas about nonviolence and civil disobedience. However, Bose was also a more radical figure than Gandhi, and believed that the only way to achieve Indian independence was through armed struggle.

Despite their differences, Bose admired Gandhi and recognized his role as a national leader. In a radio broadcast in 1944, Bose referred to Gandhi as the ‘Father of the Nation’, a term that quickly gained currency and is now widely used to refer to Gandhi in India.

It is worth noting that while the title ‘Father of the Nation’ is often used to refer to Gandhi, it is not an official title and is not recognized by the Indian government. Additionally, some critics have argued that the title is inappropriate given the complex and contested nature of Gandhi’s legacy, and the fact that he was only one of many leaders who played a role in India’s struggle for independence.