Which sentence is punctuated correctly?

In choice A, “interesting” and “exciting” are coordinate adjectives: each independently describes “things,” and they can be joined by “and” (“interesting and exciting things”). A comma correctly separates them. In the other choices, the adjective pairs do not need commas: “cute brown puppy,” “huge purple kites,” and “old metal monkey bars” use adjectives that work together to describe the noun.

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