Comparing Two High-Profile Cases of "Scientific Jury Selection" -- the "Harrisburg

Comparing two high-profile cases of "scientific jury selection" -- the "Harrisburg Seven" in Pennsylvania in 1972 and OJ Simpson in 1995 -- most people who know the cases can agree that:

A) both cases represent a triumph of scientific jury selection.
B) both cases demonstrate 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.