The correct option is A Aircraft malfunctioning while travelling from Taipei to Japan.
In 1945, the Indian National Army had to stop its activities because it could not fight under the circumstances created by the Japanese surrender in the Second World War. When INA surrendered in Burma, Bose and a few companions escaped. Later, on 18 August 1945, he started his plane journey from Taipei to Japan and the plane caught fire. Bose sustained severe injuries from the plane crash, which supposedly led to his death. It is still a mysterious affair.