A stock market's main role is as both a 'primary market' and a 'secondary market'. Which of the following is the main aspect of stock markets' role as secondary markets?
A. They permit takeovers by means of share exchange.
B. They allow investors to sell their investments.
C. Owners of a company coming to the market for the first time can realise some of the value of their shares on flotation.
D. They enable organisations to raise new capital.