The correct option is A 1934
After a resolution of supporting the movements of the princely states was passed in Haripura summit of the congress in 1938 CE, Prajamandals were systematically organised in various states. Marwar Prajamandal was one of them set up in 1934 by Jainarayan Vyas. On 28th March 1941, ' Responsible Governance Day' was celebrated by 'Marwar Prajamandal.'