问题如下：
Which of the following descriptions about markets is most correct?
选项：
A. Primary markets are defined as markets that securities trade after the initial issuance.
B. Secondary markets refer to the markets where newly issued stocks are sold.
C. Continuous markets are the markets that securities can trade any time when the makets are open.
解释：
C is correct.
Primary markets are defined as markets issuing new securities. Secondary markets are the place that issued securities are traded.
b为什么是错的？二级市场不是交易股票的市场吗？ 一级市场就是发行股票，而二级市场是交易这些发行的股票呀？ 哪里有问题