The correct options are
A In 1857, Emperor Bahadur Shah Zafar was declared as the ruler behind the revolt of 1857.
B The Indian Sepoys were enraged when Mangal Pandey was hanged.
Mangal Pandey was hanged on the 29th of March, 1857. He was charged with the crime of attacking his officers in Barrackpore.
Emperor Bahadur Shah Zafar was recognised as the leader of the Rebellion of 1857 and by all accounts, the ageing emperor had no choice but to accept.