The correct option is B 10th May, 1857
News of the event in Bengal spread like a wild fore. on May 9, 1857, eighty-five sepoys refused to touch the cartridges on the parade ground. They were sentenced to 10 years of rigorous imprisonment. On May 10, 1857, all the sepoys at Meerut rushed to the jail and set free their comrades and other convicts.