Which of the following sentences uses commas correctly?
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A
The tour guide, a cheerful and knowledgeable woman, pointed out several historical landmarks.
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B
The tour guide a cheerful and knowledgeable woman pointed out several historical landmarks.
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C
The tour guide, a cheerful and knowledgeable woman pointed out several historical landmarks.
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D
The tour guide a cheerful, and knowledgeable woman, pointed out several historical landmarks.