Leaders of Revolt

After the rebels reached Delhi, they declared the ageing Mughal emperor Bahadur Shah Zafar as their symbolic leader. His authority helped give the uprising a wider political legitimacy, even though he had limited practical control. Mangal Pandey, Rani Lakshmibai and Nana Saheb were associated with other centres or roles. Therefore, option A is correct.

Mangal Pandey was a sepoy at Barrackpore whose actions in March 1857 became an important early episode associated with the uprising against Company rule. The wider Revolt of 1857 began at Meerut in May. The Swadeshi, Champaran and Salt movements occurred in the twentieth century, so option A is correct.

Rani Lakshmibai led the resistance of Jhansi during the Revolt of 1857. She became one of its most prominent symbols because of her military leadership against Company forces. The Quit India, Non-Cooperation and Khilafat movements belonged to the twentieth-century national movement and involved different leaders and circumstances. Thus option A is correct.