I'm happy to help with this.

I am going to assume that the word "these" is suppose to be part of the underlined section, as all of the underlined sections in the answer choices end with "these" or "the".

(A) There are also, unfortunately, of the myriad of concerns facing our nation, especial reason to be concerned about government corruption both within and without the legislative and executive branches these
In the context of the whole sentence, this produces a run-on sentence ---- this underlined portion is a full clause, and what follows is another full clause with no break and no conjunction. This is incorrect.
BTW, here's a blog about run-on sentences:
http://magoosh.com/gmat/2012/run-on-sen ... questions/
(B) Unfortunately, there are, of the myriad concerns facing our nation, especial reason for concern regarding government corruption both within and without the legislative and executive branches; the
The semicolon break is a good idea in principle. There is no obvious grammar flaw I see ---- I guess my biggest complaint would be the awkward broken-up way the sentence begins. The construction "there are" is not particular powerful ---- unfortunately, we are stuck with it in all five answer choices here --- so the most direct we can make the sentence is to put the "there are" right next to the subject of the sentence. Choice (B) has an intervening modifier, which breaks up the flow. This is not a 100% decisive flaw --- if the other four answers are trainwreck disasters, we could go with this as a "best possible" answer, but we dearly hope to find something better.
(C) Of the myriad concerns facing our nation, especially there is reason for government corruption both within and without the legislative and executive branches; these
Reason for government corruption? Maybe so, but this drastically changes the meaning of the sentence. This is incorrect.
(D) Especially there is reason to be concerned over government corruption, out of the myriad concerns facing our nation, as it is both within and without the legislative and executive branches, the
This is excessively wordy and indirect, and with only a comma break, this is also a run-on sentence. This is incorrect.
(E) Of the myriad concerns facing our nation, there is especial reason to be concerned about government corruption both within and without the legislative and executive branches as these
This puts the modifier at the beginning, out of the way --- that's good. Direct and sleek structure --- good. The "as these" structure at the end makes the whole latter part of the sentence, after the underline, a separate dependent clause, so there's no run-on sentence problem. This is free of grammatical flaw and very well constructed, so this is by far the best possible answer.

Please let me know if anyone reading this has any questions.

Mike
_________________

Mike McGarry
Magoosh Test Prep

Dear Piyushm01,
That's a fantastic question.

First of all, the adjective "especial" is exceedingly rare. It actually makes this sentence sound a bit awkward, because the adjective form of "especial" is almost never used. This word is used almost exclusively in its adverb form, "especially". That's one huge difference ---- 99% of the time, you will see the adjective "special", not the adverb, and 99% of the time, you will see the adverb "especially", not the adjective.

Both words mean "out of the ordinary" ----- the difference is subtle. The word "special" connotes rising above the ordinary or standing out from the ordinary ---- "special delivery", "a special occasion", etc. The words "especial" and "especially" connote something unique to a particular noun. We never talk about someone being "specially good at something", but we would talk about something being "especially good at something" ---- that is to say, a level of "goodness", a level of talent or competence, that characterizes this individual and sets this individual apart from others.

Again, don't take the usage in this sentence as typical. As I have said, it is exceedingly unusual to see the adjective form "especial" in any context.

Mike
_________________

Mike McGarry
Magoosh Test Prep