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Industrialization and modern methods of insect control have

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Industrialization and modern methods of insect control have improved the standard of living around the globe **while at the same time they have introduced some 100,000 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 some 100,000 dangerous chemical pollutants, having
B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
D. but introducing some 100,000 dangerous chemical pollutants at the same time that have
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having

3 Answers

M87W
0
Bofua Bruno Good question. The fact that GMAT does not like redundant expressions, the word "while" in this context must be functioning as "whereas". Hence, you may still use "at the same time" with "while" as the intended meaning shows contrast from something that provided improvement but then also did something bad.
answered Jul 8, 2016 by Beginner (21 points)
Rohit Jangid
0
Introducing is wrong here. Meaning is conveyed in C
answered Jul 8, 2016 by Beginner (19 points)
bhawna_1
0
Sir, Isn't "while at the same time redundant??? Actually I used POE here and end up with B even though suspicious
answered Jul 8, 2016 by Beginner (1 point)
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