What Is the Major Difference Between Posttraumatic Stress Disorder (PTSD)

What is the major difference between posttraumatic stress disorder (PTSD) and acute stress disorder?

A) In acute stress disorder, the client is likely to develop exacerbation of symptoms.
B) In PTSD, the recovery rate is 80% within 3 months.
C) The severity and duration of the trauma are the most important variables in acute stress disorder.
D) In PTSD, the symptoms occur 3 months or more after the trauma.