Concept:The 1857 revolt began as a mutiny of Indian sepoys, especially in the Bengal army, and is historically regarded in India as the First War of Independence.Explanation:Statement I is correct because the uprising of 1857 is commonly called the First War of Independence in Indian historiography.Statement II is also correct because the revolt first erupted among the Bengal army sepoys.At that time, Indians had no significant organised political platform; the military was the only sphere where Indians were systematically organised.Therefore, the grievances of the sepoys spread quickly and triggered the wider rebellion.Answer:Option C: Both I and II.