According to the Text, It Is Not Easy to Calculate

According to the text, it is not easy to calculate the false positive rate for most types of trace evidence because:

A) jurors feel unprepared and lacking specialized education to understand such details.
B) judges would not allow it in court testimony by a forensic expert.
C) forensic examiners do not want to participate in studies of error rates.
D) this is not a research question scientists are interested in answering.