Part A
The theme of “Why the Cat Always Lands on Its Feet” is "There is comfort in taking responsibility for one’s own actions."
Part B
The detail from the text that best supports this theme is: “She was slight compared to the enormous serpent. But as she watched the evil one glide toward the man, the memory of the magician’s kindness to her transformed her fear to anger.” This detail illustrates how the character's reflection on past kindness helps her respond to a challenging situation, demonstrating the importance of acknowledging one’s responsibilities and the impact of their actions.