Q. Who was a key founder of the Congress Socialist Party (CSP)?
Answer: Acharya Narendra Dev
Notes: Acharya Narendra Dev, from Uttar Pradesh, was a principal founder and ideological mentor of CSP, established in 1934 within the Indian National Congress. He synthesized socialism with Indian realities. Pant, Nehru, and Tandon were prominent Congress leaders from Uttar Pradesh but were not CSP's main founders.