Which Is True According to a RAND Study

Which is true according to a RAND study?

A) Investigators spend little time reviewing reports
B) The single most important determinant of whether or not a case will be solved is the response time of the investigator.
C) An investigator spends more time identifying the perpetrator than he does in post- clearance processing.
D) Latent fingerprints rarely provide the only basis for identifying a suspect.