Final answer:
The psychological condition characterized by persistent, non-specific worry lasting for at least six months is Generalized Anxiety Disorder (GAD).
Step-by-step explanation:
The psychological condition that is characterized by persistent, nonspecific worry lasting for at least six months is Generalized Anxiety Disorder (GAD). Unlike occasional feelings of anxiety, GAD involves excessive worry and tension that is often unrealistic or out of proportion with the actual chance or impact of feared events. Individuals with GAD find it difficult to control their worry, which can lead to a variety of physical symptoms, such as fatigue, headaches, muscle tension, muscle aches, difficulty swallowing, trembling, twitching, irritability, sweating, and hot flashes. This condition affects a significant portion of the population and requires treatment to manage the symptoms effectively. Given the duration and non-specific nature of the worry described in the question, the correct answer is b) Generalized Anxiety Disorder.