Which of the Following Is a Consistent Pattern Observed in a Number

Which of the following is a consistent pattern observed in a number of studies of the market that suggests there is an element of market inefficiency?

A) Heavy industry experiencing far greater returns from projects whose capital was raised with equity than with debt.
B) Higher returns being achieved from investing in companies having a higher dividend payout ratio.
C) Companies employing woman as Presidents achieving significantly higher earnings than those with men as Presidents.
D) Purchases or sales of shares providing greater returns when traded on certain days of the week and certain months of the year.
E) Markets showing a significantly greater decline on days of severe weather such as snow, thunderstorms or unusually high winds.