Final answer:
The muscle that is NOT involved with adduction when closing the vocal folds with great force to project your voice at a football game is the posterior cricoarytenoid muscle.
Step-by-step explanation:
The muscle that is NOT involved with adduction when closing the vocal folds with great force to project your voice at a football game is the B. posterior cricoarytenoid muscle.
The posterior cricoarytenoid muscle is primarily responsible for abducting the vocal folds by pulling them apart, allowing air to pass through during breathing.
In contrast, the lateral cricoarytenoid, transverse arytenoid, and oblique arytenoid muscles are all involved in the adduction of the vocal folds, which is necessary for phonation and projection of the voice.