Read the following excerpt from a US court opinion:
```
Id. First, the communication must be “predecisional;” in other words, it must be “antecedent to the adoption of an agency policy.” Jordan, 591 F.2d at 774; Access Reports v. Dep’t of Justice, 926 F.2d 1192, 1194 (D.C.Cir.1991). In determining whether a document is predecisional, an agency does not necessarily have to point specifically to a final decision, but need only establish “what deliberative-process is involved, and the role played by the documents in issue in the course of that process.” Coastal States, 617 F.2d at 868. In other words, as long as a document is generated as part of such a continuing process of agency decision-making, the deliberative-process protections of Exemption 5 may be applicable. Id.; Nat’l Ass’n of Home Builders v. Norton, 309 F.3d 26, 39 (D.C.Cir.2002) . Second, the communication must be
```
What is the most suitable continuation to the opinion? Your options are:
A. holding that a document is predecisional if it was prepared to assist an agency in arriving at a decision rather than supporting a decision already made
B. holding that a guidance document is not binding where it provided only a list of factors the agency would consider rather than a clear statement of policy
C. recognizing that the existence of a copy of a decision in a bill file along with numerous references to a decision of the court of appeals in the legislative history indicated that an amendment was made in response to that decision
D. holding an agency decision is not final during the time the agency considers a petition for review
E. holding that guidelines although advisory and only one factor among others to be considered in arriving at a reasonable sentence are entitled to substantial weight in the sentencing decision
Reply with [A, B, C, D, E] only.