Describe the events of war of independence

The main event which became the immediate cause of the war was the refusal of the Sepoys to use the grease covered cartridges (greased with fat of pig and cow) on January 23, 1857. At the same time, an Indian sepoy killed two British officers at Barrackpore, when he was forced to use greased cartridges.

the answer to this question is the third option. hope this

d. it spread christianity. i just took the test and got it right.