Final answer:
Convertible preferred stock and non-convertible preferred stock differ in terms of yields and the benefits received as the common stock price rises. II, III are the statements which are true.
Step-by-step explanation:
I - The statement is false. Convertible preferred stock generally carries lower yields than non-convertible preferred stock, since the convertible feature adds value to the security.
II - The statement is true. Non-convertible preferred stock usually offers higher yields compared to convertible preferred stock.
III - The statement is true. The price of convertible preferred stock typically increases as the price of the underlying common stock rises, allowing the holders to benefit.
IV - The statement is false. Non-convertible preferred stockholders do not directly benefit as the price of common stock rises.