Which of the Following Is Not Correct

Multiple Choice

Which of the following is not correct?

A) There is a greater reduction in risk by increasing the number of stocks in a portfolio from 1 to 10,than by increasing it from 100 to 120 stocks.
B) The historical rate of return on stocks has been about 5 percentage points higher than the historical rate of return on bonds.
C) Stock in an industry that is very sensitive to economic conditions is likely to have a higher average return than stock in an industry that is not so sensitive to economic conditions.
D) If you had information about a corporation that no one else had,you could earn a very high rate of return.This contradicts the efficient market hypothesis.