A firm has $100 in equity and $ 300 in debt. The firm recently issued bonds at the market required rate of 9 percent. The firm’s beta is 1.125, the risk-free rate is 6 percent, and the expected return in the market is 14 percent. Assume the firm is at their optimal capital structure and the firm’s tax rate is 40 percent. What is the firm’s weighted average cost of capital (WACC)（）

A. 7.8%.

B. 5.4%.

C. 8.6%.

下列有关台湾的说法，正确的是[ ]

A．台湾岛是我国的第二大岛

B．台湾省东隔台湾海峡与福建省相望    

C．地跨热带、北温带、北寒带    

D．自古以来是我国不可分割的神圣领土