Why is micro-spectrophotometry useful to a forensic technician?

A) Micro-spectrophotometry can tell otherwise identical looking substances apart
B) Micro-spectrophotometry is useful in determining the Becke line of car paint
C) Micro-spectrophotometry can tell apart substances with different appearances but different molecular makeup
D) Micro-spectrophotometry is an inexpensive, portable means of determining forensic outcomes