Which of the Following Statements About Efficient Markets Is Correct

Which of the following statements about efficient markets is correct?

A) In strong- form efficiency,all available information is rapidly incorporated into market prices.However,superior returns can consistently be earned on a share through lots of hard analytical work.
B) In strong- form efficiency,the returns on a firm's bonds and shares should be identical.
C) In weak- form efficiency,all public information is rapidly incorporated into market prices.
D) In weak- form efficiency,analysing past price history of a company's shares will not enable an investor to earn an above- normal rate of return on the shares in the future.