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Explanation:

Between sentences A and C, sentence C is a more appropriate introductory sentence. In A, “only such a full-hearted leap will allow…” is more of a conclusion than introduction.
Sentence E follows C, as c introduces the idea of fuel cell economy, and E continues that idea by putting across that the current efficiency is 30 percent.
Sentence D follows E, the sentence (D) furthers the idea in E by referring to its efficiency with keyword ‘that’ – “that is twice as good…”.
Sentence B justifies further improvement and A concludes the paragraph.
Hence, the correct answer is option 1.

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