Why would an emperor have a betraying general killed on the polo playing field?

To warn those who were following the general to quit it, seeing the consequences.

The emperor knew of the generals plans so he invited the general to play polo with him. During it, he had those loyal to him beat the general with a polo stick after throwing him off the horse. The emperor did this to show that mercy won't be shown to those who show treason.

Explanation:

what are the options so i can answer it

"the sepoy rebellion was the result of many, many influences and stressors on the cultures of india living under british rule. in britain, it's called the sepoy mutiny on the indian mutiny, but in india, it's called the first war of independence.

the main reason is concerned to the british paramountcy , the belief in british   dominance in india political, economic and cultural life had been introduced in india about 1820."

"they were forced to grow crops that benefited the colonizing nations instead of feeding their own people."