The correct answer is option 3, Manipur. Polo, the game played on horseback where two teams try to score goals by hitting a small ball with long-handled mallets, is said to have originated in Manipur, an Indian state located in the northeastern part of the country.

In Manipur, polo has a long history and was played by the Manipuri kings and nobility as early as the 1st century AD. The game was called "Sagol Kangjei" in Manipuri language and had religious and cultural significance. It was not just a game but also a way for the Manipuri warriors to showcase their horsemanship and skills in battle.

It later spread to other parts of the world through British colonial rule. The British soldiers stationed in Manipur during the late 19th century saw the game and introduced it to the Western world. Today, polo is played globally and is considered a prestigious sport.

Therefore, the game of polo is said to have originated in Manipur, making option 3 the correct answer.