The correct answer is option 4: Forward Block. Subhash Chandra Bose founded the Forward Block party in 1939. The Forward Block was a left-wing political party formed with the aim of opposing British colonial rule in India. Bose formed this party after resigning as the president of the Indian National Congress due to ideological differences and disagreements with Mahatma Gandhi. The Forward Block advocated for complete independence from British rule and promoted socialism and secularism. It aimed to unite all anti-imperialist forces in India and played a significant role in the liberation struggle against British rule. The party still exists today and is active in Indian politics, advocating for social justice and national integration.