Final answer:
The daughter of Creon for whom Jason leaves Medea is Glauce. She tragically dies after receiving poisoned gifts from Medea, marking the first murder in Euripides' tragedy.
Step-by-step explanation:
The daughter of Creon, the young, beautiful princess for whom Jason abandons Medea, and who accepts the poisoned coronet and dress as "gifts," leading to the first murder of the play, is A. Glauce. In Euripides' tragedy, Medea takes her revenge on Jason for betraying her by sending Glauce a poisoned dress and a golden coronet, which burn her and her father Creon to death when they touch them. This horrific event sets the tragic tone for the rest of the play and underscores the extreme lengths to which Medea is willing to go in order to make Jason suffer for his betrayal.