Suppose That Research Shows That by Buying Stocks Issued by Companies

Suppose that research shows that by buying stocks issued by companies whose names begin with the letter G investors can earn above-normal returns in even-numbered years. From the perspective of the efficient markets hypothesis,

A) this is further evidence that the hypothesis is correct.
B) this would be considered a pricing anomaly.
C) investors must have insider information on these companies.
D) purchasers of these stocks must have been noise traders.