Final answer:
c. Common stockholders are not guaranteed dividend payments by the firm.
Step-by-step explanation:
Out of the given statements, the one that is NOT true about common stock is C) Owners of common stock are guaranteed dividend payments by the firm.
Dividends are payments made by a company to its shareholders as a portion of its profits. While common stockholders may receive dividend payments, there is no guarantee as dividend payments are determined by the company's financial performance. The amount and frequency of dividend payments can vary and are not guaranteed.