Many financial experts believe that policy makers at the Federal Reserve, now viewing the economy as balanced between moderate growth and low inflation, are almost certain to leave interest rates unchanged for the foreseeable future.

A.Reserve, now viewing the economy as balanced between moderate growth and low inflation, are
B.Reserve, now viewing the economy to be balanced between that of moderate growth and low inflation and are
C.Reserve who, now viewing the economy as balanced between moderate growth and low inflation, are
D.Reserve, who now view the economy to be balanced between that of moderate growth and low inflation, will be
E.Reserve, which now views the economy to be balanced between moderate growth and low inflation, is

Many financial experts believe that policy makers at the Federal Reserve, now viewing the economy as balanced between moderate growth and low inflation, are almost certain to leave interest rates unchanged for the foreseeable future.

A.Reserve, now viewing the economy as balanced between moderate growth and low inflation, are
B.Reserve, now viewing the economy to be balanced between that of moderate growth and low inflation and are
C.Reserve who, now viewing the economy as balanced between moderate growth and low inflation, are
D.Reserve, who now view the economy to be balanced between that of moderate growth and low inflation, will be
E.Reserve, which now views the economy to be balanced between moderate growth and low inflation, is

OA is A.
2 problems with B: between that of moderate growth. - what does that applies to? and
and are. which propositions is "and" linking?
C. the problem is the "who". This leaves the proposition introduced by "believe that" verbless.
D. Same as C, in addition, "will be" is awkward. "they will be certain to do something in the future". the meaning is not the same as they are (now) certain that they will do something in the future.
E. "which" and "is" relate to the Federal Reserve. This deprives the proposition "that policy makers at the Federal Reserve", of which policy makers are the subject, of a verb.

um... what's your question? you didn't ask a question in your post.

the fastest way to resolve this problem:

* "view NOUN to be ADJ" is unidiomatic; "view NOUN as ADJ" is idiomatically correct.
- this gets rid of (b)(d)(e) in one stroke.

* (c) isn't a complete sentence.
- you can ignore "many financial experts believe that", which is a "warmup". what's left should be a complete sentence.
in order to determine whether these choices are complete sentences, you can kill the modifier that's set off by 2 commas in each. you can also kill the prepositional phrase "at the federal reserve".
if you do so in (a), you get "policy makers are almost certain...", which is a complete sentence.
if you do so in (c), you get "policy makers who are almost certain...", which is not a complete sentence.