Answer : 2. "Gandhi and Ambedhkar"
Explanation :

With the efforts of leaders like Rajagopalachari, Jayakar, Tej Bahadur Sapru, Ghanshyam Das Birla etc., an agreement was signed between Mahatma Gandhi and Dalit leader Ambedkar on 24 September 1932 AD. This agreement is known in history as 'Poona Agreement'.