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Question:

Each of the questions below consists of a set of labelled sentences. These sentences, when properly sequenced, form a coherent paragraph. Choose the most logical order of sentences from the options.

Experts such as Larry Burns, head of research at GM, reckon that only such a full hearted leap will allow the world to cope with the mass motorisation that will one day come to China or India.
But once hydrogen is being produced from biomass or extracted from underground coal or made from water, using nuclear or renewable electricity, the way will be open for a huge reduction in carbon emissions from the whole system.
In theory, once all the bugs have been sorted out, fuel cells should deliver better total fuel economy than any existing engines.
That is twice as good as the internal combustion engine, but only five percentage points better than a diesel hybrid.
Allowing for the resources needed to extract hydrogen from hydrocarbon, oil, coal or gas, the fuel cell has an efficiency of 30%.

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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