The logic behind the efficient markets hypothesis EMH is that If a stock's price is "too low," rational traders will quickly take advantage of this opportunity and pushing prices up to the proper level. Likewise, if prices are "too high," rational traders will pushing the price down to its equilibrium level. O a sell the stock; sell the stock O b. buy the stock; sell the stock buy O c. sell the stock; buy the stock O d. buy the stock; buy the stock