问题如下：
LJF firm recognized a $350,000 writedown of inventory values in 20X8, but reversed the $350,000 writedown in 20X9 and increased the inventoy's carrying value. It is least likely that
选项：
A. LJF firm was under the U.S. GAAP.
B. The COGS would decrease by $350,000 in 20X9.
C. The reason of the reversal also need to be disclosed.
解释：
A is correct.
Under the U.S. GAAP, the writedown of inventory cannot be reversed. The inventory reversal under the IFRS can be treated as an decrease of the COGS and the reversal reason should be disclosed in notes.
美国准则不是不允许回溯吗？？？
