Final answer:
In the book 'The First Rule of Punk', Obe talks to Ms. Hidalgo, the librarian, as the first adult about Marvin Gardens.
Step-by-step explanation:
The first adult that Obe talked to about Marvin Gardens in the book 'The First Rule of Punk' by Celia C. Pérez was Ms. Hidalgo, the librarian. When Obe was researching the animal that he discovered in the creek named Marvin Gardens, he approached Ms. Hidalgo to ask for her help in identifying it.
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