Here is the sentence:

Frances searched the car trunk, on the pantry shelves, and the top of the refrigerator, but she could not find the box of cornflakes she remembered buying.

When you list grammatical items, you must use parallel structure. Here, the car trunk and the top are both noun phrases, but on the pantry shelves is a prepositional phrase, wrecking the parallelism. You chose a delectable answer!

To fix the error, change on the pantry shelves to the pantry shelves.

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