[单项选择]　　Companies with large scale need a way to reach the savings of the public at large. The same problem, on a smaller scale, faces practically every company trying to develop new products and create new jobs. There can be little prospect of raising the sort of sums required from friends and people we know, and while banks may agree to provide short-term finance, they are generally unwilling to provide money on a permanent basis for long-term projects. So companies turn to the public, persuading people to lend them money, or take a share in the business in exchange for a share in future profits. Thus they do by issuing stocks and shares in the business through the Stock Exchange. By doing so they can put into circulation the savings of individuals both at home and abroad. 　　When the saver needs his money back, he does not have to go to the company with whom he originally placed it. Instead, he sells his shares through a stockbroker to some other savers who is earnest to invest his money.
A. run by the Government or our local authorities
B. in constant need of financial support
C. financed wholly by rates and taxes
D. unable to provide for the needs of the population