The correct answer is option 4: Second World War. The formation of the Indian National Army (Azad Hind Fauz) coincided with the Second World War. The Second World War began in 1939 and lasted until 1945.

During this time, Netaji Subhas Chandra Bose, who strongly believed in armed struggle for India`s independence, sought the help of the Axis powers, particularly Japan and Germany, to fight against the British rule. Bose formed the Indian National Army (INA) in 1942, initially with Indian prisoners of war captured by the Japanese. The INA`s objective was to liberate India from British rule and establish an independent nation.

The INA played a significant role in the Indian Freedom Struggle. It fought against the British in Burma and the Northeast, and its members were known as "soldiers of the Azad Hind" or "Netaji`s soldiers." Although the INA did not achieve its ultimate goal of liberating India during the war, it instilled a sense of patriotism and inspired many Indians to join the struggle for independence.

It is important to note that options 1, 2, and 3 are incorrect as they do not coincide with the formation of the Indian National Army. First World War (option