please explain and provide correct answer otherwise downvote and downvote

1) Steve \"Uncle Stevie\" Cohen is speaking to Sandy Alderson about \"efcient capital markets theory\". Uncle Stevie would be correct if he stated the following about \"efficient capital markets": a) A market in which a security trades is priced efficiently b) Based on available information. there is no reason that the current share price is too high or too low 0) Although market inefficiencies may exist, they are relatively small and uncommon d) The theory is nonsense and is just taught so professors can sell textbooks e) All of the above 2) How is return on investment (ROI) of an equity security calculated? a) It cannot be calculated b) Adding the dividend to a company's share price 0) Adding the dividend yield to the coupon rate d) Adding the capital gain percentage to the dividend yieid 6) All of the above 3) How is return volatility on a security measured? a) Variance and standard deviation b) Normal distribution 0) Bell curve d) a. b. and c e) None of the above