Explanation:

- Option 1: Tatya Tope

- He was a notable figure in the 1857 rebellion but not in Bihar.

- He played a significant role in the Central Indian territories.

- Option 2: Nana Sahib

- Nana Sahib was involved in the revolt, especially in Kanpur.

- He was not linked to leading the revolt in Bihar.

- Option 3: Kunwar Singh

- Kunwar Singh was a prominent leader of the Revolt of 1857 in Bihar.

- He hailed from the Jagdishpur region and was a key figure in the uprising in that area.

- Option 4: Bakht Khan

- He was an important commander in the rebellion but associated with Delhi.

- Not directly connected with leadership in Bihar.