Someone had broken into Sam's house! Police came to investigate and a crime scene analyst collected evidence: broken glass, a piece of torn cloth, swabs from blood drops. Sam watched the crime scene analyst and thought he'd like to do that one day. It was a scientific way to solve puzzles! "You'd better get busy and study!" said his mother. "You know forensic scientists must have strong backgrounds in ." A) chemistry.
B) geology.
C) law.
D) mathematics.