问题如下：
The most likely example of a reversal pattern is:
选项：
A.Rectangle.
B.Flag.
C.Double bottom.
解释：
C is correct.
Double bottom pattern is a reversal pattern for downtrend. Examples of reversal patterns include: head and shoulders, double top and triple top, which are for uptrend. For downtrend, there are inverse head-and shoulders pattern, Double bottom, and triple bottom.
不明白这道题，请讲一下，谢谢！
