Which of the Following Statements Is Correct

Which of the following statements is correct?

A) In a semi- strong- form efficient market,the expected returns on shares and bonds must be the same
B) It is possible to have some irrational investors in a rational market even though the theory of market efficiency assumes that markets behave as if all investors are rational
C) In a strong- form efficient market,high beta shares must have the same expected return as low beta shares
D) In a weak- form efficient market,an investor cannot outperform the market even with private information