Answer: Strong form Efficiency-c
Explanation:
Strong form of market efficiency is the strongest form of efficient market hypothesis, by Burton G. Malkiel, states that future market price movement cannot be predicted by technical analysis, fundamental analysis or inside information instead it efficiently deals with all information on a given security and reflects it in the price immediately. He added by saying the best way to maximize returns is by following a buy-and-hold strategy.
Sabrina and her father always get consistent abnormal result because even though her father gets inside information indicating when there is increase and decrease in profits concerning stock at RSG, it will not influence the stock prices at RSG.