What tragic fate befell Ismene and Antigone's parents?

The tragic fate of Ismene and Antigone's parents, Oedipus and Jocasta, is indeed notable and aligns with answer B. In the narrative of "Oedipus Rex," Oedipus, upon discovering the horrific truth of his identity—that he has killed his father and married his mother—blinds himself in a fit of despair. This act of self-mutilation symbolizes his profound guilt and anguish over the realization of his actions. Subsequently, Jocasta is overwhelmed by the shame and horror of these events and takes her own life by hanging. Their story serves as a significant backdrop to "Antigone," illustrating themes of familial tragedy, fate, and the consequences of human ignorance.

The other choices do not accurately reflect the events surrounding Oedipus and Jocasta. For instance, there is no narrative in which either parent is merely banished or involved in a battle. The notion of exile alongside the other options misrepresents the weight and severity of the tragic outcomes faced by Oedipus and Jocasta.