Which of the following statements about stock valuation is least likely correct（）
A. If estimated value ＜ the market price, buy the stock : it's under priced.
B. If the expected rate of return ＞ the required rate, buy the stock; it's under priced.
C. If the expected rate of return ＜ the required rate, don't buy the stock; it's under priced.
