Correct Answer : Champaran
Tinkathia System or Tinkathia Pratha was a system under which the native peasants of Champaran were forced by the European planters to use 3/20th of their landholding to cultivate Indigo.
The European planters practised illegal methods to grow indigo, however, with the help of Rajendra Prasad and Gandhiji the peasants of Champaran organised Satyagraha and abolished the system.