问题如下：
One investor uses buy and hold strategy and makes annual deposits each year for five years, which return method is most suitable to assess the investment performance?
选项：
A.解释：
A is correct.
As the previous year's earnings is compounded to the beginning value of the investment at the beginning of each year, geometric mean return is the best method to evaluate the return.
为什么 ？？？好郁闷。。。说了又买又卖又存的，这么多cash flow的流动，为什么不是irr
