What type of evidence might be collected from a crime scene for serological analysis?

Serological analysis involves the study of bodily fluids to identify and analyze biological evidence relevant to a crime scene investigation. The correct choice highlights that various types of bodily fluids, including blood, semen, and saliva, can be collected for this type of analysis.

Blood is often the most frequently analyzed fluid due to its abundance and the multitude of information it can provide, such as DNA profiling or blood type determination. Semen can help in sexual assault cases and assist in identifying potential suspects through DNA. Saliva can also yield DNA and is often recovered from bite marks or other evidence where a person may have been present.

The other options are limited in the type of evidence they mention. For instance, suggesting only blood or only urine samples does not encompass the broader range of serological evidence available, while the option focusing solely on hair and fibers completely misses the crucial role that various body fluids play in forensic investigations. By encompassing multiple types of bodily fluids, the correct answer reflects the diversity of evidence that can be crucial for revealing insights about the crime, linking suspects to the scene, or establishing victim profiles.