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B
1958
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C
1970
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D
1978
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Solution
The correct option is B 1958
The Great Leap Forward (1958) was a campaign undertaken by the Chinese communists to modernize China's economy. As a part of this campaign, hundreds of million of sparrows were killed with the belief that they might eat the grain harvest. But the following year, 1959, it was noticed that insect infestation of crop fields had soared up and pests such as locusts lost their major predator, the sparrow. Thus the correct answer is option B.