Directions: Select the phrase from the options below that should replace the underlined phrase in the sentence to make it grammatically and contextually correct. If the sentence is already correct, select 'No correction required' as your answer.
The phenomenon of children acquiring languages effortlessly is a testament to the remarkable adaptability of young minds.
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is a testament of
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are a testament to
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is an testament to
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is a testament for
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No correction required