The answer is C, the oil reserve buried deep below the surface. Not only did it take millions of years for the oil to form from the remains of previously living organisms, but the conditions under which the oil formed have changed. We cannot replace the oil found under the ground once we have used it up--this is what it means to be non-renewable. Your other choices are all examples of renewable resources for energy. For A, the sun's energy is captured by the plants through photosynthesis, and will last as long as the sun burns. In choice B, rice and bamboo will continue to grow as long as they continue to receive sunlight and moisture. For choice D, water flowing through a dam, electricity will be generated as long as the water continues to flow.
Estimates vary as to the length of time that non-renewable energy sources, such as oil and other fossil fuels, will last if we continue to use them at our present rates. Once they are gone, we cannot get more. This is why it is important to explore various types of renewable energy sources such as water, wind, biomass and solar power if we hope to be able to continue our present style of living. Even if we discover vast new stores of fossil fuels, at some point they will run out.
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