GMAT Practice Question Set #13 (Question 37-39)

Sentence Correction Question #37: Geiger Counters & Atmosphere  
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Data collected by high-end geiger counters has been observed by physicists, stating that the Earth's atmosphere has become far thinner since the beginning of the nineteenth century, due to increased levels of green house gas and carbon dioxide emissions from the world's largest factories that are not running on energy-efficient fuel.

(A)

Data collected by high-end geiger counters has been observed by physicists, stating that the Earth's atmosphere has

(B)

Data collected by high-end geiger counters has been observed by physicists, and they state the Earth's atmosphere as having

(C)

After observing data collected by high-end geiger counters, physicists state that the Earth's atmosphere has

(D)

After observation of data, collected by high-end geiger counters, physicists state the Earth's atmosphere as having

(E)

After data collected by high-end geiger counters was observed by physicists, who state that the Earth's atmosphere has

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