Explanation

Blank (i)

The clue is: “poorly organized”, “conclusions could not be readily grasped”
So the reports are hard to understand.
Opaque literally means “not transparent,” but figuratively it means: unclear. confusing, difficult to understand

That perfectly matches the context.

Correct answer: B

Blank (ii)

If reports are confusing, people will ask: “What did you mean?”, “Can you explain this?”, “Can you clarify?”
Correct Answer: E. clarification
Clarification means: explanation, making something clearer
This is the natural consequence of opaque reports.

D. ratification

Means: formal approval, official confirmation
Departments are not asking for approval because the reports are unclear.

F. arbitration

Means: conflict resolution by a neutral third party
Nothing in the sentence suggests disputes or legal conflict.

Blank (iii)

The sentence says the follow-up communications continue the problem. So the follow-ups are likely: rushed, poorly written, low quality

Correct Answer: G. hastily

Hastily drafted means: written too quickly, careless because of rushing
This logically causes further confusion and inefficiency.

H. diplomatically
Means: tactfully, politely
Diplomatic writing would not perpetuate inefficiency.

I. incomprehensibly
Means: impossible to understand
This is tempting, but grammatically and stylistically it is weaker here:
“incomprehensibly drafted” is awkward usage. The sentence emphasizes the process problem (rushed communication), so hastily is more natural and logically connected to institutional inefficiency.

Also, if something is incomprehensible, it usually describes the content, not the drafting process itself.

Final Answer: B,E,G