Which of the following statements is true regarding post-traumatic stress disorder?
a. ptsd is rare among people in treatment for substance use disorders.
b. ptsd is experienced only as a psychological phenomenon.
c. ptsd is rare among women.
d. ptsd is prevalent among combat veterans.

 The correct answer is :   D. PTSD is prevalent among combat veterans.

Explanation:  This disorder is developed by people in response to traumatic events, such as military actions. The disorder can occur at any age even in childhood. The diagnosis of PTSD is restricted to people who have suffered threatening and distressing events, such as sexual abuse, bombing, members of the military, police, victims of war or terrorism, among others.

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.