问题如下：
Which of the following will most likely decrease operating income?
选项：
A.Decreasing the manager's compensation.
B.Increasing the depreciation useful life of equipment.
C.Decreasing the depreciation useful life of equipment.
解释：
C is correct.
Decreasion the equipment's useful of depreciation will result in higer depreciaion expense and increase operation income.
Decreasion the equipment's useful of depreciation will result in higer depreciaion expense ？不应该是lower吗？
