The demand for "Purna Swaraj" or complete independence was made by the Indian National Congress in option 2 - Lahore in 1929.

Option 1 - Bombay in 1885 is incorrect because the Indian National Congress was founded in Bombay in 1885, but the demand for complete independence was not made at that time.

Option 3 - Kheda in 1917 is incorrect because in Kheda, the Indian National Congress supported the peasants during the Kheda Satyagraha against the oppressive land revenue policies of the British government. However, the demand for complete independence was not made there.

Option 4 - Bombay in 1942 is incorrect because in Bombay in 1942, the Quit India Movement was launched by the Indian National Congress, demanding an end to British rule in India. However, the demand for complete independence was made earlier in Lahore in 1929.

Therefore, option 2 - Lahore in 1929 is the correct answer.