Final answer:
The best event illustrating the monster's good side in Frankenstein is saving a drowning girl.
Explanation:
The event that best illustrates the monster's good side in Frankenstein is D. Saving a girl who was about to drown.
This event showcases the Creature's capacity for compassion and empathy, demonstrating a side of him that goes beyond the initial monstrous perception.
By saving the girl, the Creature exhibits a sense of morality and kindness, challenging the typical stereotype of being a pure evil monster.
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