Option A is incorrect. Please help thank you.

Stock "A" has a level of systematic risk, Beta_ A=1.5, and statistics show that the expected return on the market portfolio is 12% and the risk-free rate is 4%. If Stock " A " has a disequilibrium rate of return equal to 12%, you would a. Conclude that it is over-priced b. Conclude that it is under-priced c. Expect stock " A " to be sold in the market to restore equilibrium d. Both a and c e. Not enough information to tell