The correct answer is: C. 1930 AD
Praja Mandal was a political movement in the princely states of India that aimed to achieve responsible government. It was founded in 1920 by Lala Lajpat Rai and other leaders. The movement was successful in achieving its goal in many princely states, including Kunihar, where it was organized in 1930.
Option A is incorrect because the Praja Mandal was not organized in 1920.
Option B is incorrect because the Praja Mandal was not organized in 1925.
Option D is incorrect because the Praja Mandal was not organized in 1939.