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    Question

    The scientists believe that their breakthrough could

    ______ the future of renewable energy. The following question carries one statement with one blank. Choose the most appropriate word from the options to fill the blank.
    A obscure Correct Answer Incorrect Answer
    B hinder Correct Answer Incorrect Answer
    C revolutionize Correct Answer Incorrect Answer
    D maintain Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    The word "revolutionize" means to change something fundamentally or dramatically, which aligns perfectly with the context of the sentence, suggesting that the scientists believe their breakthrough could significantly transform the future of renewable energy. The other options—"obscure" (make unclear), "hinder" (delay or prevent), and "maintain" (keep the same)—do not convey the positive, transformative impact implied by the breakthrough.

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