Heather Believes That by Carefully Examining a Company's Fundamentals and by Applying

Heather believes that by carefully examining a company's fundamentals and by applying the best valuation models she can identify stocks whose market prices are lower than their intrinsic values. In order for this to be true

A) she needs an accurate estimate of future earnings and dividends.
B) some stocks must be incorrectly priced.
C) betas must be stable over time.
D) P/E ratios for both the stock and the market must be stable over time.