Final answer:
Jean-Martin Charcot and Pierre Janet focused on studying individuals with psychological trauma, contributing significantly to our understanding of psychological health and its impacts. Hence, option (B) is correct.
Step-by-step explanation:
To understand human behavior, French physicians Jean-Martin Charcot and Pierre Janet studied people with psychological trauma. Charcot is renowned for his work in neurology and his studies into what was then known as hysteria, which today we understand as a psychological phenomenon.
Janet was a psychologist and psychotherapist whose research contributed significantly to the fields of psychology and psychoanalysis, particularly in the areas of dissociation and the subconscious mind. Both made substantial contributions to the understanding of the complexities of psychological health and its impact on behavior.