The sentence that uses modifiers correctly is option B: 'To avoid cavities, flossing daily is recommended.' This sentence clearly links the action of flossing with the goal of preventing cavities. Options A and C either create confusion or ambiguity in their meanings.
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The sentence that correctly uses modifiers is option b: 'To avoid cavities, flossing daily is recommended.' This sentence clearly links the action of flossing to the purpose of avoiding cavities. It provides a clear meaning without ambiguity. ;