Which of the following phenomena would be either consistent with or a violation of the efficient market

Question:

Which of the following phenomena would be either consistent with or a violation of the efficient market hypothesis? Explain briefly.
a. Nearly half of all professionally managed are able to outperform the S&P 500 in a typical year.
b. Money managers that outperform the market (on a risk-adjusted basis) in one year are likely to outperform in the following year.
c. Stock prices tend to be predictably more volatile in January than in other months.
d. Stock prices of companies that announce increased earnings in January tend to outperform the market in February.
e. that perform well in one week perform poorly in the following week.

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