The CAPM beta on a stock portfolio is a weighted average of each stocks beta where the weights are based on the: A) original amount invested in each stock/total original investment of the portfolio. B) number of shares owned of each stock/total number of shares of the portfolio. C) market price per share of each stock/average market price of the portfolio. D) market value of the investment in each stock/total market value of the portfolio. E) cost per share of each stock held/average cost per share of the portfolio.