Let's break down the whole syntax first.
Charles Lindbergh,
for his attempt at a solo transatlantic flight, was very reluctant to have any extra weight on his plane,
he therefore refused to carry even a pound of mail,
despite being offered $1,000 to do so. (Adverbial Phrases are been crossed out) > Whats important the most? :
[It is his 'Refusal' of something to do so]
[He = Charles Lindbergh]
> Which part(s) could be grammatically wrong? :
Charles Lindbergh, was very reluctant to have any extra weight on his plane, he
therefore refused to carry even a pound of mail,
despite being offered $1,000 to do so. [
therefore is not a conjunction.]
-----[Jules' Quick Solution]--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
For all below:
(Adverbial Phrases are been crossed out based on importance level)(A) Charles Lindbergh,
for his attempt at a solo transatlantic flight, was very reluctant to have any extra weight on his plane, he
therefore > 'CL was reluctant ~~~ he
there fore refused ~~~'
=
there fore is not a [Conjunction] but a [Conjunctive Adverb]
- Could be one of colloquial sayings.
(B) When Charles Lindbergh
was attempting his solo transatlantic flight,
being very reluctant to have any extra weight on his plane, he
> 'When he
was attempting, he refused'
= sounds award: Was CL really in such situation, which could be
the real moment of him stepping off his foot, thereby beginning his transatlantic fight?
(C)
Since he was very reluctant to carry any extra weight on his plane
when he was attempting his solo transatlantic flight,
so Charles Lindbergh
>
are redundant
(D) Being very reluctant to carry any extra weight on his plane
when he attempted his solo transatlantic flight was the reason that Charles Lindbergh
> 'Being very ~~~, was the reason 'that' CL refused ~~~'
= Doesn't sound good to me at all
(E) Very reluctant to have any extra weight on his plane when he attempted his solo transatlantic flight, Charles Lindberg
> 'Very reluctant to have any extra weight ~~~, CL refused ~~~'
= 'CL' 'refused' [Subject] [Verb] stay together
= 'CL' is explicitly written as the person who did the main verb (refused)
-
Very reluctant to have any extra weight could be the second important information, which tells the reason why the [Main Subject] did [Main Verb] of the sentence.