Sentence Correction

sungoal wrote: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.
A. Charles Lindbergh, for his attempt at a solo transatlantic flight, was very reluctant to have any extra weight on his plane, he therefore [Semicolon is required to introduce an independent clause]
B. When Charles Lindbergh was attempting his solo transatlantic flight, being very reluctant to have any extra weight on his plane, he [Being - modifier error]
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 [wrong construction]
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 - modifier error]
E. Very reluctant to have any extra weight on his plane when he attempted his solo transatlantic flight, Charles Lindbergh [Correct answer, Charles current modifies 'very reluctant..']

Source: GMATPrep

Experts please explain why option D is wrong. I found D similar to a officially correct sentence below:

Being heavily committed to a course of action, especially one that has worked well in the past, is likely to make an executive miss signs of incipient trouble or misinterpret them when they do appear. This is a correct answer picked from OG12 SC question. What is the difference in the sentence structure between this sentence and option D mentioned above

sungoal wrote: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.
A. Charles Lindbergh, for his attempt at a solo transatlantic flight, was very reluctant to have any extra weight on his plane, he therefore
B. When Charles Lindbergh was attempting his solo transatlantic flight, being very reluctant to have any extra weight on his plane, he
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
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
E. Very reluctant to have any extra weight on his plane when he attempted his solo transatlantic flight, Charles Lindbergh

Source: GMATPrep

Experts please explain why option D is wrong. I found D similar to a officially correct sentence below:

Being heavily committed to a course of action, especially one that has worked well in the past, is likely to make an executive miss signs of incipient trouble or misinterpret them when they do appear. This is a correct answer picked from OG12 SC question. What is the difference in the sentence structure between this sentence and option D mentioned above

Being heavily committed to a course of action, especially one that has worked well in the past, is likely to make an executive miss signs of incipient trouble or misinterpret them when they do appear.