Among the Following Scenarios, Which Raises a Strong Challenge to the Validity

Among the following scenarios, which raises a strong challenge to the validity of a set of diagnostic criteria for post-traumatic stress disorder?

A) A crime victim is diagnosed on the basis of long-term difficulties with daily activities that were routine before the traumatic incident.
B) A police officer is diagnosed on the basis of his becoming emotional in the immediate aftermath of a shootout.
C) A soldier is diagnosed on the basis of symptoms that are not recognized by another recognized set of criteria.
D) A firefighter is diagnosed after displaying symptoms of the disorder after a particular incident, despite the fact that other firefighters who were also on the scene do not have symptoms.