The correct option is A Aircraft malfunctioning while travelling from Taipei to Japan.
British aircrafts started warfare against the Indian National Army (INA). When the INA surrendered in Burma, Bose and a few companions escaped. Later, on 18 August 1945, as he started his plane journey from Taipei to Japan, the plane caught fire. Bose sustained severe injuries from the plane crash, which supposedly led to his death. It is still a mysterious affair.