When Supreme Court Justice Blackmun Heard That the Prediction of Violence

When Supreme Court Justice Blackmun heard that the prediction of violence is wrong 2 out of 3 times, he concluded that predicting violence using a coin flip would be more accurate. Why was he wrong?

A) The specificity of a coin flip is above 50%.
B) The sensitivity of a coin flip is above 50%.
C) The base rate of violence is much lower than 50%.
D) The coin flip is random, not based on clinical judgment.