Punctuation Correction in Complex Sentence

Very Hard Usage And Mechanics Punctuation

Read the following sentence carefully:

After reviewing the final chapter of the book, which included several critical plot twists I found myself debating whether the ending was truly satisfying.

Which of the following changes would correct the punctuation error in this sentence?

After reviewing the final chapter of the book, which included several critical plot twists, I found myself debating whether the ending was truly satisfying.

After reviewing the final chapter of the book which included several critical plot twists, I found myself debating whether the ending was truly satisfying.

After reviewing the final chapter of the book, which included several critical plot twists I found myself debating whether the ending was truly satisfying.

After reviewing the final chapter of the book which included several critical plot twists, I found myself debating whether, the ending was truly satisfying.

Hint

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