The correct answer is Calcutta.![image](//cdn. Points

• The Anushilan Samiti was a prominent revolutionary organization in India during the early 20th century, actively involved in the Indian freedom struggle.

• Its headquarters were located in Calcutta (now Kolkata), which was the epicenter of many nationalist movements at the time.

• Founded in 1902, the Samiti primarily operated in Bengal and was instrumental in promoting the idea of armed struggle against British colonial rule.

• Anushilan Samiti was deeply influenced by the teachings of leaders like Bankim Chandra Chattopadhyay and Swami Vivekananda, focusing on nationalism and self-reliance.

• Its members included prominent revolutionaries like Aurobindo Ghosh, Barindra Kumar Ghosh, and others who played a vital role in the Indian independence movement.![image](//cdn. Information**

• Bombay (now Mumbai):

• Bombay was another significant center for the Indian independence movement but was not associated with the headquarters of Anushilan Samiti.

• It was the base for organizations like the Indian National Congress and movements led by leaders such as Bal Gangadhar Tilak and Gopal Krishna Gokhale.

• Madras (now Chennai):

• Madras played an important role in the spread of nationalism in southern India.

• The Justice Party and the Dravidian movement originated here, focusing on regional and social issues.

• Poona (now Pune):

• Poona was a stronghold of Bal Gangadhar Tilak, who was a prominent freedom fighter and the founder of the Home Rule Movement.

• The city was also home to revolutionary activities.