Which of the following statements about the implications of tests for the efficient market hypothesis (EMH) is least accurate（）
A. By purchasing an index fund, an investor can match the market return and minimize costs.
B. Other than corporate insiders and market specialists, most traders have monopolistic access to information, which rejects the p-form EMH.
C. The best way to measure the performance of investments professionals is against a randomly selected buy-hold strategy of stocks (assuming the same risk level).