Read the following excerpt from a US court opinion:
```
part: “For purposes of removal ..., the citizenship of defendants sued under fictitious names shall be disregarded.” After removal, however, Casas replaced the fictitious defendants with Caguas and Oficentro, which were clearly identified as Puerto Rico corporations, like Casas itself. The issue is whether this substitution, which unquestionably destroyed complete diversity, also defeated federal subject matter jurisdiction. We hold that it did. Casas argues that as diversity jurisdiction was established at the commencement of the proceeding, it was not later defeated by the mere naming of the fictitious parties, who were dispensable, not indispensable. E.g., Freeport-McMoRan Inc. v. K N Energy, Inc., 498 U.S. 426, 428, 111 S.Ct. 858, 859-60, 112 L.Ed.2d 951 (1991) (per curiam) ; Wichita R.R. & Light Co. v. Public Util.
```
What is the most suitable continuation to the opinion? Your options are:
A. holding that diversity jurisdiction was not established by a statecourt order that provided only that the plaintiffs claims against a nondiverse defendant be and hereby are severed from this action
B. holding that in order for a defendant to remove a case to federal court based upon diversity jurisdiction there must be complete diversity of citizenship both at the time that the case is commenced and at the time that the notice of removal is filed
C. holding that because there was complete diversity when the action commenced diversity jurisdiction was not defeated by the addition of a nondiverse plaintiff which was not indispensable
D. holding diversity jurisdiction was collusively obtained because the transferor retained a onehalf interest in the outcome of the litigation and was an indispensable party but for the assignment
E. holding that although the question of diversity jurisdiction is distinct from that of immunity the analysis of citizenship determinations for eleventh amendment immunity and diversity jurisdiction are the same
Reply with [A, B, C, D, E] only.