In 1971 General Election the opposition parties formed an alliance against congress. Which of the following alliance was formed?

Grand Alliance

The electoral contest appeared to be loaded against Congress(R). After all, the new Congress was just one faction of an already weak party. Everyone believed that the real organisational strength of the Congress party was under the command of Congress(O). To make matters worse for Indira Gandhi, all the major non-communist, non-Congress opposition parties formed an electoral alliance known as the Grand Alliance. The SSP, PSP, Bharatiya Jana Sangh, Swatantra Party and the Bharatiya Kranti Dal came together under this umbrella.