Whitman's printing assignments led to his journalistic activities, and Whitman, until the age of 31, held a number of positions as a reporter, editorial writer, and editor in New York newspaper.
Meaning of the sentence
Whitman's printing assignments became a route or cause for his journalistic activities and by the time he turned 31,he held a number of positions as a reporter.................
Choice A conveys the intended meaning.
So,i will go with choice A.
A) Whitman's printing assignments led to his journalistic activities, and Whitman, until the age of 31, held
B) Whitman's printing assignments led to his journalistic activities until the age of 31, and he held(it conveys that Whitman's assignments led to his J. Activities upto the age of 31,changes the meaning)
C) Whitman's printing assignments led to his journalistic activities, leading to Whitman, until the age of 31, holding(leading to Whitman changes the meaning)
D) Whitman's printing assignments until the age of 31 led to his journalistic activities, and Whitman held(meaning change)
E) Because Whitman's printing assignments led to his journalistic activities, Whitman, until the age of 31, held( because changes the meaning)
I will go with choice A
Please correct me if I am wrong
Thanks