During the Civil War It Was Called "Nostalgia" or "Soldier's

During the Civil War it was called "nostalgia" or "soldier's heart." It became shell shock during World War I, and combat fatigue in World War II. Post-traumatic stress disorder (PTSD) is now considered a serious problem, requiring specialized treatment. What does this diagnostic and treatment evolution reveal about the sick role and society?

A) Society's definition of sickness has changed over time.
B) People used to be crueler to each other.
C) The definition of masculinity is changing for the better.
D) Society is becoming too lenient towards sick people.