Step 1: The Movement for Democracy
The movement to re-establish democracy in Nepal, specifically the 2006 popular uprising termed the "People's Movement" or Jana Andolan II, was spearheaded by the Seven Party Alliance (SPA). This coalition comprised Nepal's principal democratic political parties, such as the Nepali Congress, the Communist Party of Nepal (Unified Marxist-Leninist), and various smaller groups.
Step 2: Non-Violent Nature
The movement was characterized by its non-violent approach and its primary objective was to protest against royal autocratic rule, advocating for the restoration of democracy and constitutional rights.
Step 3: Final Answer
Consequently, the non-violent movement aimed at restoring democracy in Nepal was led by the Seven Party Alliance. The correct answer is (D) Seven Party Alliance.