Final answer:
Cordelia's compassion is best demonstrated when she expresses concern for her father's suffering and states that she would care for her enemy's dog, showing her ability to forgive and care for those who have wronged her.
Step-by-step explanation:
The text that best reveals Cordelia's ability to care for others, even if they have harmed her, is "Cordelia's compassion for those who have harmed her."
This choice is reflected in the passage where Cordelia laments her father's suffering and expresses concern for his wellbeing, despite his earlier harsh treatment of her. Her empathetic comparison with how she would treat her enemy's dog demonstrates a profound level of care and forgiveness for those who have wronged her, highlighting her compassionate nature.