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srijanbhattacharya
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 planes she flew to be of dangerously experimental design.

A and she earned them at a time when avation 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 were
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

Dividing into clauses:

By 1940 - phrase
the pilot Jacqueline Cochran held seventeen official national and international speed records = IC
and she earned them at a time = DC
when aviation was still so new for many of the planes she flew to be of dangerously experimental design.

POE

- I dont find anything wrong with A

-,earning has to modify the entire preceding clause which is ok .. it seems to extend the idea
them = records (nothing else is plural) "THAT" is wrong .. time is refered using when = ELIMINATED

-,earning is ok these = records .. where can talk about a place not time ELIMINATED

Question 1: can records be referred to as these and them ??

moving on to D...

- useless choice = Eliminate

- looks correct.

Question 2: Is my analysis correct?

Question 3:
Now between A and E I did not know how to eliminate. I tried reading the OG analysis but got more confused. Please help.

Dear Srijan,

Thank you for posting your query here as requested. :)

First of all, yes, "these" and "them" can refer to inanimate objects.

Second, let's address your analysis. The second clause is an independent clause, not a dependent one. Note that "and" is an IC marker. Also, the subject of "flew" is "she", not "planes". The sentence isn't saying that the planes flew themselves: it's saying that she flew them.

Now, with regard to your doubt about option A: use so+that when referring to a cause and effect relationship between a modifier and a clause. That is, the modifier gives you a cause, and the following clause gives you the effect. For example:

1. This bag is so heavy that I can't carry it.
2. She walks so quickly that I can't keep up with her.

This is the most common usage of so+that that you'll find in official questions: 'so' is followed by an adjective or adverb that modifies something, and 'that' is followed by the effect caused by the quality that the modifier highlights. Applying this usage to the given sentence, we get:

Cause: Aviation was so new
Effect: that many of the planes were of dangerously experimental design.

Option A tries to indicate this relationship using so+for, which is incorrect.

I hope this helps with your doubt!

Regards,
Meghna