Final answer:
The biggest difference between Counselors, MSWs, Psychologists, and Psychiatrists is their ability to prescribe medication. (option d)
Step-by-step explanation:
The most significant difference among Counselors, MSWs (Master of Social Work), Psychologists, and Psychiatrists is the ability to prescribe medication. While Counselors, MSWs, and Psychologists primarily provide therapy and counseling services, they do not have the authority to prescribe medication.
In contrast, Psychiatrists are medical doctors (MDs) who specialize in mental health and can diagnose mental disorders and prescribe medication as part of their treatment approach. The other professionals can offer various forms of counseling and therapy but typically work in collaboration with Psychiatrists when medication is deemed necessary for a patient's mental health treatment.
Therefore, the correct option is d. Ability to prescribe medication.