问题如下：
PZ company is a US-based company with US GAAP. PZ also has two European subsidiaries: LI financial service and HE financial consultant. Felix, CFA, he has prepared the forecast PZ’s 2018 financial statement:
Felix is forecasting LI financial service will report 3,500 in sales and 1,500 in cost of sales in 2018, If PZ chooses current rate method to translate subsidiary LI's data into US dollar and temporal method to translate subsidiary HE's data into US dollar. Both LI and HE use the FIFO method to account for inventory. Relative to the gross margins the subsidiaries reported in local currency, PZ’s consolidated gross margin most likely:
选项：
A.distorted if HE using the current method
B.not be distorted
C.distorted because of the translation and inventory accounting methods
解释：
C is correct.
考点：current rate method and temporal method
解析：
这一题问的是gross margin会被歪曲，而不是问gross margin一不一样
对于选项C，如果用temporal & fifo的方法，那么收入和 COGS用的转换汇率就不一样，所以gross margin会被扭曲。
比如子公司货币下：收入为5，COGS=2，那么gross margin=3/5=60%，但如果用不同的汇率转换了，比如收入的转换汇率为7，COGS的转换汇率为6，那么gross margin=（5*7-2*6）/35=65.7%，无形之中就提高了它本来的gross margin，所以gross margin会被扭曲。
如果是B，用的是current method，sales和cogs用的汇率是一样的，所以不存在这个现象
关于A选项，如果HE公司选用CR方法，COGS选用的汇率与在Temporal法下是不一样的，是否理解为被distorted？
请问A选项错在哪里？谢谢
