A is correct because retractable preferred shares are a type of preferred shares that give the holder the option to sell the shares back to the issuer at a predetermined price and within a specified time. This feature provides the holder with more flexibility and protection against interest rate fluctuations. Participating preferred shares (B) are a type of preferred shares that give the holder the right to receive additional dividends if the issuer’s earnings exceed a certain level. Convertible preferred shares © are a type of preferred shares that give the holder the option to convert the shares into common shares of the issuer at a predetermined ratio and price. Redeemable preferred shares (D) are a type of preferred shares that give the issuer the option to buy back the shares from the holder at a predetermined price and within a specified time.