Final answer:
The three disorders in a class of disorders marked by feelings of excessive fear and apprehension are Anxiety Disorders, OCD (Obsessive Compulsive Disorder), and PTSD (Posttraumatic Stress Disorder).
Step-by-step explanation:
The three disorders in a class of disorders marked by feelings of excessive fear and apprehension are Anxiety Disorders, OCD (Obsessive Compulsive Disorder), and PTSD (Posttraumatic Stress Disorder).
Anxiety disorders are characterized by persistent and excessive worry and fear that interfere with daily life. Examples of anxiety disorders include generalized anxiety disorder, panic disorder, and social anxiety disorder. OCD involves recurring and unwanted thoughts or obsessions, accompanied by repetitive behaviors or compulsions to alleviate anxiety. PTSD is an anxiety disorder that occurs after experiencing a traumatic event and is characterized by symptoms such as flashbacks, nightmares, and hypervigilance.