Final answer:
Medea's plan to kill Jason and his new bride included using poison, specifically a poisoned cloak. This act of vengeance is a testament to her mastery of sorcery and reveals the tragic nature of her character in Greek mythology.
Step-by-step explanation:
The plan options Medea considered to kill Jason and his new bride were a) Poison, fire, and a magical curse. According to the mythological accounts, Medea's acts of vengeance were premeditated and executed with cold rationality. Medea, known for her mastery of magic and sorcery, decided on using a poisoned cloak, which when worn by the bride, caused her death. This sinister act also claimed the life of the king when he attempted to save his daughter from the agonizing effect of the poison.
In the broader context of Greek mythology, Medea's character is complex and tragic. She is seen as both a wronged woman acting out of deep betrayal by Jason and as a powerful sorceress exacting her revenge through horrendous means. She used her knowledge of potions and magic to wreak havoc upon those she felt had wronged her, showcasing her proficiency in these dark arts.