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Industrialisation and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced 10000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.
a) while at the same time they have introduced 10000 chemical pollutants ,having
b)while at the same time introducing some 10000 dangerous chemical pollutants that have
c) while they have introduced some 100000 dangerous chemical pollutants at the same time , which have
d) but introducing some 10000 dangerous chemical pollutants at the same time that have
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A seems to be parallel.
Have improved....have introduced.
But , i find none of the answers convincing as it seems to suggest that chemical pollutants have gone unregulated and chemical pollutants were developed some 50yrs ago.
Comments are welcome.
OA is B. Please explain as to why it is not A. 'they' has only one antecedent and it seems to be parallel.
Did not include answer choice E) since it was clearly out.
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