By 1940, the pilot Jacqueline Cochran held seventeen official national and international speed records, and she earned them at a time when aviation was still so new for many of the planesshe flew to be of dangerously experimental design.
(A) and she earned them at a time when aviation was still so new for many of the planes she flew to be (B) earning them at a time that aviation was still so new for many of the planes she flew to be (C) earning these at a time where aviation was still so new that many of the planes she flew were (D) earned at a time in which aviation was still so new such that many of the planes she flew were (E) earned at a time when aviation was still so new that many of the planes she flew were
Let's rewrite this sentence: Chloe Moretz held hundreds of Grammy Awards, ...........
And many of the Awards she held were of exquisitely design.
So that's make sense, we elinimate A,B
E is our best choice
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