The Major Reason Class-Action Suits Became More Common After the 1960s

The major reason class-action suits became more common after the 1960s was that

A) they became financially attractive to lawyers.
B) laws changed to deregulate such suits.
C) the requirements for bringing such suits to court were easy to satisfy.
D) attorneys' fees could be shared among all plaintiffs.
E) bar associations have insisted that lawyers participate in them.