Why did the withdrawal of the Non-Cooperation Movement show that controlling a mass movement was difficult?

Correct answer: Because in huge mass participation local anger could sometimes turn violent

The governing concept is the difficulty of maintaining common discipline in a diverse mass movement. Participants came from different regions, classes, and local experiences, so their grievances and responses were not identical. In such conditions, local anger could become violent, as at Chauri Chaura, even when national leaders demanded non-violence. Options B and D deny the movement’s diversity and scale, while C reverses the historical relationship.