Which research method is the Isometsa et al.(1995) study of detailed case histories of all known suicide cases in Finland within an entire year a good example of

A)  the case study method 
B)  the experimental method 
C)  naturalistic observation 
D)  the survey method

Case Study Method

A research technique that involves the intensive examination of an individual or group to reveal underlying principles or findings.

Suicide Cases

Instances or situations where an individual intentionally takes their own life, often studied in psychology, sociology, and public health to understand contributing factors and prevention strategies.