请问b前半句说是用市场利率这个对么？
问题如下图：
选项：
A. 
B. 
C. 
解释：
It uses the market rate insteof coupon rate It also means the cost of retaineearning B is correct. After-tcost of uses the market rate insteof coupon rate.A和C可以一下吗？
A；Requirerate of Return 就是 cost of equity 吗？不需要在加上各种 Risk Premium 吗？
It uses the market rate insteof coupon rate It also means the cost of retaineearning B is correct. After-tcost of uses the market rate insteof coupon rate. After-tcost of uses the market interest rate on new bt.搞不懂这道题了
cost of equity 不是包含cost of preferrestock和cost of common equity两部分吗
