Once you attempt the question then PrepInsta explanation will be displayed.
The first sentence states that nature, by and large, is benign but sometimes nature's capriciousness is manifest in the form of floods, earthquakes, volcanic eruptions, etc. Statement C says that despite all this we have been fortunate and our civilization has developed against a backdrop of relative geological calm. The last statement contrasts with statement C by saying that the omens for the next century are 'far from encouraging'. Therefore only statement C forms a logically coherent paragraph with the two given statements. Statements A and B can come after the last statement - but cannot be inserted between the two given statements.
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