We need to apply the subject -objective syntax system in solving this particular question.

Option A - INCORRECT.
It would have appeared more logical for the subject nominal phrase Federal Bureau of Investigation to come first before the adjectival clause although it is a federal body which is used to qualify it. The sentence although correct, needs structural rearrangement to make it more understandable. The use of although and nevertheless here is contrasting because both can be used to serve the same purpose.

Option B - INCORRECT.
It is still the same case as in A above but with a better arrangement here. It is almost archaic to see ''although'' being a conjunction start a sentence in modern day sentence formation.

Option C - INCORRECT.
The arrangement here looks a bit better but for some shortcomings. The use of Do should ordinarily be used for a First-person singular word subject words or statements like ''i do''. In this case, entity as FBI isn't what we can personalize as such.

Option D - INCORRECT.
This statement here falls in the same category as in C Above. With the explanation given in respect to the Do and Does it's an incorrect option.

Option E - CORRECT.
Here, the nominal phrase subject ''Federal Bureau of Investigation'' comes first then the conjunction ''although'' which aims to explain further what FBI stands for then followed by the second-person singular. Does appropriately represents the arrangement we crave in the original statement above. It is thus the most correct of all.