Forensic science is so popular that schools use it to get students interested in chemistry and biology, and new college programs seem to pop up every semester. Educated first by "C.S.I." and "Law and Order," students go on to appreciate the procedures and precision of the science as much as figuring out whodunit. Consider all the exacting specialties in which a forensic scientist can be certified: footwear, DNA, hair and fibers, drug chemistry, fire debris, to name a few.

Which of the alternatives below is represented on the text by the expression whodunit?