When was Indian National Trade Union Congress formed?

May 1947

The correct answer is Option (3) → May 1947

"..During the last few years of British rule the communists gained considerable control over the AITUC. The Indian National Congress chose to form another union called the Indian National Trade Union Congress (INTUC) in May 1947. The split in the AITUC in 1947 paved the way for further splits on the line of political parties. Apart from the working class movement being divided on the lines of political parties at the national level, regional parties too started to form their own unions from the late 1960s. "