为什么不选c，确实头肩顶是上升趋势的。

问题如下：

Which of the following is generally true of the head and shoulders pattern?

选项：

A.Volume is important in interpreting the data. B.The neckline, once breached, becomes a support level. C.Head and shoulders patterns are generally followed by an uptrend in the security’s price.

解释：

Volume is necessary to confirm the various market rallies and reversals during the formation of the head and shoulders pattern.