关于商业信息，正确的说法是( )。

A．任何社会活动都能产生商业信息

B．商业信息只发生在商品流通企业

C．商业信息反映了商品流通企业在经营中发生的相关的商业活动的内容形式、变化过程及其发展规律

D．商业信息就是销售信息

Which of the following statements is true of John Maynard Keynes a. He liked to attend beauty contests. b. He would keep on buying and selling hot stocks. c. He often bought in stocks of lesser companies. d. He preferred investing stocks to trading stocks.