Concept: The success of a revolt often depends on the level of popular backing it receives.Explanation: The Mahdist revolt succeeded because it gained widespread support from the Sudanese people.This broad popular backing provided the movement with enough fighters, resources, and local legitimacy to overthrow Egyptian authority.Other factors, like religious belief or Gordon's leadership, played a smaller role compared to the massive civilian support behind the uprising.Answer: C. There was a widespread support.