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Paygrade is the level that groups enlisted ranks. Sergeant Major is a senior enlisted rank that sits at the top of the pay scale. In the Marine Corps, the top paygrade is E-9, and both Sergeant Major and Master Gunnery Sergeant are at that paygrade. So the paygrade that includes the rank Sergeant Major is E-9.

The other options don’t fit as well: E-8 is one level lower, Master Gunnery Sergeant is a rank name, not the paygrade, and listing both ranks points to titles rather than the actual paygrade.