In the context of market efficiency,...

a.

None of the statements about market efficiency is true.

b.

All of the statements about market efficiency are true.

c.

the size and momentum profits suggest that the market might be inefficient even in the weak form.

d.

the profitability of insiders trading suggests that the market is efficient in the strong form.

e.

the gradual increase in the stock price following a firms positive earnings surprise indicates market efficiency in the semi-strong form.