Comparing Two High-Profile Cases That Used Scientific Jury Selection, the "Harrisburg

Comparing two high-profile cases that used scientific jury selection, the "Harrisburg Seven" in Pennsylvania in 1972 and the O. J. Simpson trial in 1995, most people who know the cases would say that:

A) both cases demonstrate the importance of scientific jury selection.
B) both cases show a failure of scientific jury selection.
C) scientific jury selection failed in one case and triumphed in the other.
D) neither case is a good example of scientific jury selection.