No one can tell exactly whether the shareswill be doing well because ______________阅读文章，回答下面的题目：There are stock markets in large cities in many countries. Stock markets in Paris,London, Tokyo, Shang hai and New York are among the largest and mostwell-known. The stock market, also called stock exchange, is a place wherepeople can buy or sell shares of a factory or a company. And each share meanscertain ownership of a factory or a company.Different people go to stock markets.Some are rich, who want to get more money than they have. Others are not rich,who buy stocks and try to become rich. Still others buy stocks as part of theirplan to save money. Of course, investing money in the stock market is not thesafest way to make money. No one can tell exactly whether the shares will bedoing well. The factory or the company may do badly. Then the stocks will godown, and investors will lose money. The stock may go up or down for a numberof untold reasons. Everyone wants the stock to go up, but sometimes even if afactory or company does a good job, the stock may still go down. No wondergoing to the stock market is often compared to gambling. All are anxious tomake money by"gambling" in the stock market. Factories and companiesthat need money are pleased that so many people are willing to"gamble".According to the passage, if you have a share of a company or a factory, itmeans that you______________

A. stock markets are not the safest place tomake money
B. the factory or the company may do badly
C. the stock may go up or down for a numlSer ofuntold reasons
D. sometimes even if a factory or company does agood job, the stock may still go down