Answer:
D. varying risk premiums
Explanation:
Fama and French has a total of three factors considered in the study:
Size of firms, book to market values, and the additional return on the market.
For all these market anomalies the study is based on the varying risk premiums assigned.
As for the market efficiency the out performance is explained by the risk and value that is of small stocks due to high cost of capital associated, and with that there is great business risk also associated.
