To attack this type of questions is always better to look first for the conclusion, if any, and then try to identify, after reading the whole argument, the BF parts.
Conclusion: Independent observers who follow the federal bench believe that the extensive corporate involvement among so many of the nominees is unprecedented.
The phrase mentioned before, is the conclusion of the argument. The author acknowledge the first sentence as true, but thinks that there is something more going on.
Now, in order to back its conclusion, the author should mention some premises or evidence of the claim he tries to make.
Premises: The nominees with industry ties were overwhelmingly appointed to circuit courts regarded as traditional battlegrounds over litigation affecting these industries.
Independent observers who follow the federal bench believe that the extensive corporate involvement among so many of the nominees is unprecedented.
In both premises above, the author is trying to support his view that there is something more going on by showing that nominees are somehow backing the industries and litigation over those are battlegrounds because of the biases that the nominees have over those specific industries. Moreover, the author states that independent observers believe that the corporate involvement is unprecedented as a way to supports its claim.
BF1. Background.
BF2. Support of author conclusion = Premise.
Now let's check answer choices and try to match them with BF1 and BF2. Work from wrong to right:
A. The first is a generalization that the author aims to attack; the second is that attack.
I do understand that the first part of the answer may seem right, but the reality is that the author does not aim to attack. It just providing some context and then claiming that there is something more going on. The second part, is not an attack but a support of the author's claim.
B. The first is a pattern that the author acknowledges as true; the second is the author’s conclusion based on that acknowledgment.
The first seems like our classification of BF1. Part 2 of the answer is wrong, the BF2 is a PREMISE not a CONCLUSION.
(C) The first is a phenomenon that the author accepts as true; the second is evidence in support of the author’s conclusion.
Both part of the answer are align with our classification of the bold faces.
(D) The first is the author’s position based on the evidence cited; the second is a pattern presented in support of that position.
The first is not the author position, is an acknowledge of the situation, but you can say that this statement is close enough, so let's see the second part. The second part is wrong. It is not a support of that position, but a support of the conclusion.
(E) The first is an exception to a rule introduced in the argument; the second provides the reasoning behind the exception
First part: Wrong. It is not an exception rule, is actually what is going on. Second Part: Wrong. As mentioned before is a premise of the author's conclusion.