The correct option is D 5 March, 1931
On 5 March, 1931, Gandhi and Irwin signed a peace pact in which both parties agreed to conditions put forth by the other. According to this pact, Irwin agreed to release those who had been imprisoned during the movement and to allow Indians to make salt for domestic use. Gandhi agreed to call off the Civil Disobedience movement and attend the second Round Table Conference in London.