问题如下：
An analyst has prepared a table of the average trailing twelve-month price-to-earning (P/E), price-to-cash flow (P/CF), and price-to-sales (P/S) for the Tanaka Corporation for the years 2005 to 2008.
As of the date of the valuation in 2009, the trailing twelve-month P/E, P/CF, and P/S are respectively, 9.2, 8.0, and 2.5. Based on the information provided, the analyst may reasonably conclude that Tanaka shares are most likely:
选项：
A.overvalued.
B.undervalued.
C.fairly valued.
解释：
A is correct.
Tanaka shares are most likely overvalued. As the table below shows, all the2009 multiples are currently above their 2005–2008 averages.
Average 7.1 7.3 1.7
我认为这道题出的不合理，pe、pcf、ps都是动态发展的数据，没有任何交代，该企业处于什么发展阶段，但是单看2005-2008的变化，市场在不断给出更高估值，且是已经给定的估值。为啥不能采用同比的视角，以2008年的数据来看呢？
