In the Mahabharata, Why Did Draupadi Reject Karna?

In the Mahabharata, the Draupadi Swayamvara (groom-choosing ceremony) is an important episode that brings together a number of concurrent threads:

The Pandavas meet Draupadi for the first time.Krishna and Balarama make their first public appearance in the story.Arjuna’s prowess as an archer is established outside the Kuru kingdom, in an open competition.Drupadi rejects Karna, which sows a seed of discord that she will reap later during the dice game.

Of all these, here we will focus pr...