The answer is: [C]: Neither Juan nor Christina are correct.
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Explanation:
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Consider Juan's statement:
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"Juan said fossils deposits always contain only one type of organism."
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This statement is incorrect. There are many instances of fossil deposits containing more than one type of organism.
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Consider Christina's statement.
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"Christina said fossil deposits never contain one type of organism."
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This statement is incorrect. Fossil deposits, by definition (of "fossil") ALWAYS contain at least one type of organism.
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As such, neither Juan nor Christina are correct.
And as such, Answer choice: [C] is the correct answer.
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Answer choices A, B, and D are ruled out.
