The correct answer is option 1, the Sepoys. The Revolt of 1857, also known as the Indian Rebellion of 1857 or the First War of Independence, was initiated primarily by Indian Sepoys (soldiers) in the British East India Company`s army. The Sepoys were dissatisfied with various grievances, including their treatment and pay by the British East India Company. They also opposed the use of animal fat in the cartridges of the newly introduced Enfield rifles, as it conflicted with their religious beliefs. However, it is important to note that the Sepoys were not the only group involved in the revolt. There was also participation and support from other sections of Indian society, including peasants, zamindars (landowners), and other discontented groups.