This is a Term Reference question.
"perhaps unexpectedly" is highlighted with "--" because the "remedy" coordinated for troubled individual and corporation was not intended for creditors in the first place and yet it ended up benefiting them. Got wrong on this question while rushing..
Let's go to the answer choices.
A) Specific term of "compensation in bankruptcy courts" is not discussed.
B) The author never said that creditors were the "chief" beneficiaries. They were "unexpected" beneficiaries.
C) Since they were probably NOT considered when formulating the law, they were referred as "unexpected."
D) This is the paraphrase of "they unexpectedly benefited from the measure designed for debtors", which is what we discussed above. This is Correct.
E) Way off. We can't find support for this anywhere in the passage.