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Technological change in extracting crude oil

Can someone help me in determining the right answer from the given options. A good illustration of technological change would be a discovery of a: (i) Pool of oil as big as any in Kuwait merely a bit south of Cleveland. (ii) Tenth planet as big as Neptune circling our sun. (iii) Cheaper technique for extracting crude oil from shale. (iv) Lost concerto written by the Mozart shortly before he expire.

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