The correct answer is D) In 1931 the Congress Session at Karachi opposed Gandhi-Irwin Pact.

Explanation:
The Gandhi-Irwin Pact was signed on March 5, 1931, between Mahatma Gandhi and Lord Irwin, the then Viceroy of India. The pact marked a significant development in the Indian freedom struggle. However, the Congress Session at Karachi did not oppose the pact.

- The Rowlatt Act aroused a wave of popular indignation and led to the Jallianwala Bagh Massacre:
The Rowlatt Act was passed by the British government in 1919. It gave the colonial authorities sweeping powers to arrest and detain Indians without trial. This act resulted in widespread protests and opposition from the Indian populace. The Jallianwala Bagh Massacre, which took place on April 13, 1919, was a brutal event where British troops opened fire on a peaceful gathering in Amritsar, resulting in the death of hundreds of people. The Rowlatt Act and the Jallianwala Bagh Massacre were pivotal moments in the Indian freedom struggle, leading to increased public anger and a stronger resolve to fight for independence.

- Subhash Chandra Bose formed the Forward Bloc:
Subhash Chandra Bose was a prominent leader in the Indian freedom struggle. He was dissatisfied with the policies of the Indian National Congress and formed the Forward Bloc in 1939. The Forward Bloc aimed to unite all anti-imperialist forces and fight for complete independence from British rule. Bose played a significant role in organizing the Indian National Army (INA) and leading armed resistance against the British during World War II.

- Bhagat Singh was one of the founders of the Hindustan Republican Socialist Association:
Bhagat Singh was a revolutionary and one of the most influential figures in the Indian freedom struggle. Along with his comrades, Sukhdev and Rajguru, he formed the Hindustan Republican Socialist Association (HRSA) in 1928. The HRSA was a revolutionary organization that sought to overthrow British colonial rule through armed struggle. Bhagat Singh's actions, including the Lahore Conspiracy Case and the bombing of the Central Legislative Assembly, were significant contributions to the fight for independence.

- In 1931 the Congress Session at Karachi opposed Gandhi-Irwin Pact:
This statement is incorrect. The Congress Session at Karachi in 1931 did not oppose the Gandhi-Irwin Pact. In fact, the pact was signed with the agreement and support of the Indian National Congress. The Gandhi-Irwin Pact marked a brief truce between the British government and the Indian National Congress, leading to the release of political prisoners and the participation of Congress in the subsequent Round Table Conferences to discuss constitutional reforms. The Karachi Congress Session focused on discussing and formulating future strategies for the freedom struggle.