Why were the sepoys disconted with the british rule​

The sepoys, who were Indians trained by the British as soldiers, heard rumors that the cartridges for their new Enfield rifles were greased with cow and beef fat.

2) They were discontented because their salaries & opportunities of promotion were not equal to those of British soldiers

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all of the choices are correct

answer; ///i believe that the correct answer is (a) the great depression