The theme in Joan Didion's "Goodbye to All That" is "Youthful enthusiasm, optimism, and naïveté can lead a person to "fall in love" with a place."
The theme refers to the subject on which the writing is based. The theme of "Goodbye to All That" by Joan Didion is that the beauty of the place is appreciated more by the visitors. And the youth of the place and its enthusiasm makes the person fall in love with the place.
Therefore the correct option is D.
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