Final answer:
The FBI's Microscopic Unit examines objects associated by microscopic comparison, such as hairs and fibers, in forensic investigations. Hence the correct answer is option A
Step-by-step explanation:
The subject of this question is Forensic Science, specifically the field of forensic anthropology. The FBI's Microscopic Unit examines objects associated by microscopic comparison, such as hairs and fibers, to gather evidence in criminal investigations. For example, they may analyze hairs to determine the mitochondrial DNA and fibers to study their mineralogy.
Hence the correct answer is option A