Final answer:
In Euripides' play "Medea," the line spoken by Medea that best encapsulates her decision regarding her children is: option (A) "I will not leave my children to the mockery of my enemies."
Step-by-step explanation:
The line spoken by Medea that best encapsulates her decision regarding her children is: option A) "I will not leave my children to the mockery of my enemies."
Medea is determined not to abandon her children and allow them to become targets of ridicule by her enemies. This line demonstrates her fierce determination to protect her children, even in the face of extreme circumstance and personal agony.