Final answer:
NFL contracts do not prevent players from being cut after one year, although certain guarantees may offer some financial security. The correct answer is option B.
Step-by-step explanation:
The correct answer to the question about NFL contracts is OB: They don't prevent players from being cut after one year. While multi-year contracts in the NFL often include a guaranteed base salary for some portion of the contract duration (OA is false), and sign-on bonuses are very common (OC is false), contracts typically allow teams the flexibility to release players, sometimes with a financial penalty. It is the structure of the guaranteed money, such as signing bonuses and guaranteed salaries, that provides some financial security to players. However, players can still be released or traded based on performance or salary cap considerations. Lastly, contract negotiating power tends to correlate with the player's performance and proven value to the team rather than being evenly distributed (OD is false).