Arrange the following efforts to control pollution in chronological order.
A. In India, the air (Prevention and control of Pollution) Act was amended to include noise as an air pollutant.
B. The government of India passed the water (Prevention and Control of Pollution)Act to safeguard our water resources.
C. Recognizing the deleterious effects of ozone depletion, the Montreal Protocol became effective.
D. The National Forest Policy of India recommended 33% forest cover for the plains and 67 % for this hills.
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correct option is B)3,4,2,1
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