With no explanation, chose the best option from "A", "B", "C" or "D". inquiry can become decidedly more involved, however, if the law of different states must be determined and applied. Here, the district court certified a nationwide class. The difficulties posed by multistate classes are of three general varieties. First, multistate classes bring into sharp focus the Rule 1-023(B)(3)(c) requirement that courts consider the relative desirability of concentrating litigation in the particular forum. Second, the district court must ascertain what the law governing the cause of action in each state actually is and compare it with the forum state law. Having completed this difficult task, the court must decide which law to apply. Applying the wrong law raises problems of constitutional dimension. See Phillips Petroleum Co., 472 U.S. at 815-23, 105 S.Ct. 2965 (<HOLDING>). Third, if the forum state decides to apply

A: holding that in a diversity action a federal court must apply the law of the forum state
B: holding that it was improper to apply the law of the forum state to all issues and members in a class action in the face of conflicting substantive features unless the forum state had sufficient contact with the members of the class located in other states to satisfy due process requirements
C: holding that the filing of a class action by a class representative without standing tolls the period of limitations with regard to all asserted members of the class and that the amendment of the complaint by the addition of a class member with standing relates back to the original complaint
D: holding that entry of settlement decree without notice to putative class members violated the due process rights of the class members
B.