Which of These Is NOT a Factor Weighed by a Court

Which of these is NOT a factor weighed by a court in determining whether a class can be certified in a class action?

A) if the legal and factual claims of all the parties are common
B) if it is impracticable for individual claimants to bring multiple lawsuits against the defendant
C) if the claims and defenses are typical for the plaintiffs and the defendant
D) if the representative parties will not adequately protect the interests of the class