Eddie Has Been a Homicide Detective in a Small City

Eddie has been a homicide detective in a small city for several years and he is good at his job. He is often called on by other detectives to help with difficult cases. Which of the following reflects his fluid intelligence?

A) Eddie has comprehensive knowledge of ballistics, including the identification of weapons and interpretation of angle and distance of firing.
B) Eddie knows the history of local gangs and their allegiances from his years on the job.
C) Eddie finds that when he reads through a file, a detail will leap out at him as peculiar to the flow of events, which then helps to focus the direction of the investigation.
D) Eddie has learned a great deal about the psychology of domestic violence, which can be the underlying trigger of a homicide.