Final answer:
The forensic scientist provided the evidence against the suspect using DNA or blood typing.
Step-by-step explanation:
The correct answer is A) The forensic scientist. Forensic scientists are experts in analyzing and interpreting physical evidence in criminal cases. They use techniques such as DNA analysis or blood typing to provide evidence that can be used in court. In the example provided, Dr. Alec Jeffreys, a forensic scientist, used DNA fingerprinting to match the DNA of the suspect to that of his mother and siblings, proving their relationship.