True or false

a) Suppose that you are able to identify undervalued stocks and earn abnormal profits by comparing the average price for the last 5 days to the average price for the last 30 days. If this is true, the stock market is efficient. (b) If the stock market is (semi-strong form) efficient, publicly available information (such as news, financial statements, etc.) will not help predict stock returns.

A. (a) true ,( b) true

B. (a) true ; (b) false

C. (a) false ; (b) true

D. ( a) false ; ( b) false