--I don’t know       .

-- You can go and ask Jack.

A．when does the train leave

B．that we will plant trees or not

C．if she had come yesterday

D．what I should buy for him

下列关于股票账户的说法，正确的有( )。

A．股票账户是认定股东身份的重要凭证

B．股票账户具有认定股东身份的法律效力

C．开立股票账户是投资者进行股票交易的一个条件

D．要想买卖股票的人都可以开立股票账户