问题如下：
An increase in volumes of the price chart represents:
选项：
A.fluctuation of prices
B.a revesal of price trend.
C.the confirmation of an upward or downward price trend.
解释：
C is correct.
High volume means high turnover, which indicates that market participants is confident about the price trend. The price trend may be continuously upward or downward.
老师，price chart是指line chart还是泛指所有的价格图？
