The word "returns" in Paragraph 3 can be best replaced by"______."

A．keeping cash is the only way to avoid risks
B．the longer you own a stock, the more you lose
C．the high rate of profit and high rate of risk coexist in stocks
D．the best way to accumulate wealth is by investing in stocks

A．they are examples for us on our road to wealth
B．a portfolio is essential to financial success
C．they are really rich people
D．they started out on their own