问题如下：
Company M`s current D/E ratio is 0.25 and the tax rate is 30%. The management wants to take some actions to reduce the WACC.
Which of the following may not fulfill the objective? Relevant information regarding the cost of capital is shown in the above table.
选项：
A.Decreasing the outstanding shares.
B.Borrowing more funds.
C.Decreasing the outstanding debt.
解释：
C is correct.
考点：Summary of Capital Structure Theories
解析：现阶段公司的 WACC , 使用表格第二行数据，为 20%*5.5%*(1-30%) + 80%*10.0% = 8.77%；选项 A 和 选项 B，即当负债比例上升至 30%，权益比例下降到 70% 时，WACC 使用表格第三行数据，为 30%*6.0%*(1-30%) + 70%*10.5% = 8.61%，WACC 可以降低，所以不选 A 和 B。
计算出，随着debt的比例增加，wacc减少，所以不应该选择b吗？增加debt来减少wacc
