Final answer:
The pay grade of a Command Sergeant Major is E-9, which is the highest enlisted rank in the U.S. Army. The correct option is c.
Step-by-step explanation:
The pay grade of a Command Sergeant Major in the United States military is E-9. This is a non-commissioned officer rank and is the highest enlisted rank in the U.S. Army, just above Sergeant Major.
Military pay grades are divided into enlisted (E), warrant officer (W), and officer (O) levels, with numerical designations that increase with rank and pay.
Since the question pertains to the military rank structure, it should not be confused with the General Schedule (GS) which is related to the U.S. civil service positions. The correct option is c.