Markets are more likely to be weak form efficient than semi-strong efficient because...

a) investors can only use information provided by the SEC

b) if everyone traded on historical information,prices would fluctuate wildly

c) easy profits would lead everyone to trade on historical information

d) data from analyst reports,financial reports,and economic forecasts are arguably harder to obtain and toprocess than past stock data

e) insider information is illegal to trade on

f) historical stock price information is easy to obtain