Which of the Following Statements Is Most Correct

Which of the following statements is most correct?

A) The par value of a common stock or preferred stock is not important.
B) A convertible preferred stock gives the corporation the right to retire the preferred stock at its option.
C) The U.S. security markets are the only public financial markets in which preferred stock can be sold.
D) Similar to bonds, the fixed preferred stock dividend is a tax-deductible expense.