My vote also gos to (D)
Written in ink or engraved by stylus, more than 2,000 letters and documents on wooden tablets excavated at the site of the old roman fort at vindolanda in northern England are yielding a historical account of the military garrison in the first and second centuries that are so vivid in their details about personal life as they are from Pompeii
A. are so vivid in their details about personal life as they ate
B. are as vivid in their details of personal life as those gathered
C. is as vivid in their detail about personal life as that gathered
D. is as vivid in its details of personal life as that gathered
E. is so vivid in its details of personal life as is that
The correct idiomatic usage should be.. "as vivid...as"
So options (A), (B) and (E) are ruled out.
Secondly, since we are talking about the "historical account" here, so verb tense should be singular. hence "its" is better than "their"
Hence option (D)
Regards,
Anubhav
Every morning I go through Forbes list of 100 richest men on this planet. If my name is not in there, I go to work..!