khaleesiwantstodolaw,
I picked the same answer as you and then, after checking my work, realized I glossed over the answers too quickly. The quotation marks around the word "accommodating" mean sarcasm or scare quotes (as is accepted in literary terms [they can also mean you're quoting someone but here that's obviously not the case]. So we have to think what the author just stated in the previous, first, paragraph which deals with "The United States Supreme Court" and the fact that it "has not always resolved legal issues of concern to the Native Americans in a manner that has pleased the Indian nations." So, it's safe for us to infer that the author thinks the courts have not been accommodating to the Native Americans nor have they always been fair.
Answer choice C) says that the quotation marks provide an example/reason of "why the decisions of the United States Supreme Court have not always favored Native Americans." Thus it is the right answer.
I hope that wasn't confusing and it helped... at least a bit.