The answer would be D. Jonah was prepared for his summer advent. A Lists more things that he'll do, rather than ending the paragraph. B has nothing to do with the paragraph. C is when is about to end the passage before it even started. D tells the reader that the list is ending, while telling them that he is prepared for summer camp. I hope this helped ^^
Explanation:

As he English physicist who helped revolutionize the knowledge of atomic structure by his discovery of the electron (1897).
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1. is b
2. is a a
3. is an a
She explains to scout that boo stays inside simply because he wants to, that he doesn't want to come out. implying to scout to not "judge a book by its cover"