Dear friends,

I need your help to clarify some doubts here,


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 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
The correct answer is E.


I can not understand that "comma + Verbed" is a modifier modifies record,
does it replace "which" with "comma + earned" ?
Does comma + verbed only modifies the nearest preceding noun? if so, I think "earned" should be set off by a pair of comma,
like : ..... record + comma + earned at the time + comma + when......

would you please clarify other usage of "comma + verbed" and give me some examples?

another question, can "that" modify "time" ? only "when" can modify "time" ?

Thanks in advance