Subhas Chandra Bose had escaped from India in 1941 and gone to Germany to work for India’s Independence. In 1943, he came to Singapore to lead the Indian Independence league and rebuild the Indian National Army (Azad Hind Fauj) which was initially formed by Rash Behari Bose, to make it an effective instrument for the freedom of India. The Azad Hind Fauj comprised of about 45,000 soldiers, among who were Indian prisoners of war as well as Indians who were settled in various countries of south-east Asia. Hence, Option A is correct.
Among the rest of the options, Shah Nawaz Khan was an Indian politician who served as an officer in the Indian National Army during World War II, Khan Abdul Gaffar Khan led his non-violent Khudai Khidmatgar movement against the British Raj in the 1930s and 1940s, and Bhagat Singh was an Indian socialist revolutionary whose two acts of dramatic violence against the British in India and execution at age 23 made him a folk hero of the Indian independence movement. Hence, these options are incorrect.