Correct Option: B

Samudragupta organized Ashwamedha Yajana. When a king thought he had conquered the whole land, he used to loose a white horse. The horse would roam wherever it liked. If any body tried to capture it, he would have to fight the king's army. If the horse returned home without being captured, it meant that everyone in the land recognized the power of the king. The horse was then offered as sacrifice and killed. The ceremony was called the Ashvamedha Yajana.