Final answer:
NFL teams pay funds/dues to cover operational expenses, player salaries, and league promotional activities, with the correct answer being D) All of the above.
Step-by-step explanation:
Each team pays funds/dues to the NFL for several reasons, with the correct answer being D) All of the above. These payments are not just for a single purpose but encompass a wide range of expenses associated with the operation of the league. Operational expenses and league administration cover things like staff salaries (non-players), office expenses, and overall management of the league's day-to-day functions. Player salaries and contracts are managed through these funds, with a portion going towards the salary cap and ensuring competitive balance amongst teams. Lastly, the payments also support marketing and promotion of the league, which includes advertising campaigns, public relations, and events that help to maintain and grow the league's fan base.