The cash flows that are associated with stocks are the dividends that the firm may pay and price that the investor receives when she sells the shares. Dividends are paid only after interest and other required payments are made to creditors and they are not fixed amounts; Dividends depend on the profitability, growth prospects, investment requirements and payout decisions of the company. As a result, their timing and quantities are uncertain and they are more risky than debt securities. In order to compensate for this greater risk, they need to offer greater expected returns in order to make them attractive to investors. Therefore, the correct option is A.