Each Defendant is potentially responsible for all of Plaintiff's injury and damages. A is out because the time limit for removal passed and the nature of suit has not changed. C is out because the one year time limit on diversity suits which become removable is over. D is out if the suit is diversity based, since one of the defendants is in-state. A is out, because diversity is not required for fed q removal.
B violates the well pleaded complaint rule.
C is out, because in state defendant citizenship does not prevent fed q removal. Thus the well pleaded complaint rule is violated and Employer may not remove. C. A is out, because venue for removal is to the district in which the state court is located. B is out because the 30 day time limit applies if the case was originally removable. Removal must still be within 30 days of the time the case becomes removable.