You now learn that GPEC (a cartel of gold-producing countries) is going to vary the amount of gold produced depending on stock prices in the U.S. by producing less gold when the stock market is up and more gold when the stock market is down. Which of the following statements explains the effect will this have on portfolios composed of gold and stock? a. The standard deviation (the risk) for gold will rise. b. The standard deviation (the risk) for stocks will rise. c. The asset