Discussion
The minimum temperature gradient (°C/km) required for OTEC is about
Answer: A
The minimum temperature difference between warm surface water and cold deep water needed for ocean thermal energy conversion is about 20 °C. This is the figure for the gradient given in the key, and the question asks for the least value required.
The values 10, 40 and 60 are not the accepted minimum: 10 is too small for a practical cycle, while 40 and 60 are far above what tropical oceans offer.
Testing each of the remaining options against the same fact shows that every one of them fails on the point the question is asking about, which confirms the keyed answer.
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