问题如下：
Below listed some statements about the head and shoulders pattern, which one is correct?
选项：
A.Volume analysis is necessary to study the head and shoulder patterns.
B.Once breached, the shoulders becomes the new suppot levels.
C.The pattern predicts an increasing trend in stock price.
解释：
A is correct. Both volume and patterns are important in data analysis. The neckline is a support level, based on the polarity principle, once a support level is breached, it becomes the new resistence level. Once the head and shoulder pattern has formed, it is expected that share price will deline.
请问一下，头肩顶的公式不是只跟head和neckline的价格有关么，跟交易量有什么关系？
