Final answer:
Ignoring the symptoms of generalized anxiety disorder is an inappropriate action for a school counselor. Instead, promoting regular exercise, mindfulness, and healthy sleep are supportive interventions. Therefore, the correct option is D.
Step-by-step explanation:
An inappropriate recommendation or plan of action for a school counselor to support several middle school-aged students diagnosed with generalized anxiety disorder would be ignoring the symptoms. Anxiety and OCD can significantly impact educational experiences by making it harder for students to concentrate, process information correctly, and maintain regular school attendance. Implementing strategies such as encouraging regular exercise, implementing mindfulness practices, and promoting healthy sleep habits can help manage anxiety symptoms and therefore, support the educational and emotional well-being of the students.