It wasn’t a test day, there were no oral reports due, and the class was getting ready to view a video. Regardless of the relaxed nature of the class, Baxter suddenly felt his muscles tighten and his heart rate increase as if he had had a sudden fright. It was happening again. These symptoms are typical of:

A. a panic disorder.
B. a phobia.
C. a generalized anxiety disorder.
D. an obsession.

A

Right.

To determine the answer to this question, we need to consider the symptoms described: muscles tightening and an increased heart rate. These symptoms are consistent with the body's physical reaction to fear or fright.

Option A, a panic disorder, is characterized by sudden and recurring panic attacks, which involve intense fear and physical symptoms like shortness of breath and chest pain. However, based on the given information, there is no mention of a sudden and intense fear or panic attack occurring.

Option B, a phobia, involves an excessive and irrational fear of a specific object, situation, or activity. Although phobias can cause symptoms of fear, the information provided does not indicate that Baxter experienced an irrational fear of something specific.

Option C, a generalized anxiety disorder, involves excessive and uncontrollable worry or anxiety about various aspects of life. While anxiety disorders can cause physical symptoms such as muscle tension and an increased heart rate, the information provided does not suggest that Baxter's symptoms are accompanied by excessive worry or anxiety.

Option D, an obsession, typically refers to persistent and intrusive thoughts or urges. It is not directly associated with the physical symptoms described.

Based on the given information, the most suitable answer would be A. a panic disorder. However, it is important to note that an accurate diagnosis requires a comprehensive evaluation by a mental health professional.