Final answer:
Jason, as a mythological character, is not slated to become king of Corinth in any of the Greek myths. His stories are more about his adventures and relationship with Medea than acquiring a throne through marriage or quests.
Step-by-step explanation:
The question refers to Jason, a mythical Greek hero known from ancient Greek mythology. In the myth, Jason's claim to the throne of Corinth is not a central theme. He is, however, renowned for his quest to retrieve the Golden Fleece. Jason's tales are more focused on his adventures with the Argonauts and his complex relationship with Medea, with whom he does marry. There is no indication in the myths that marrying the princess or any specific action would grant him the throne of Corinth. Thus, given the mythological context, the answer to how soon Jason can become king of Corinth is d) Never, as the myths do not grant him this future.