There are two ways to calculate the expected return of a​ portfolio: Either calculate the expected return using the value and dividend stream of the portfolio as a​ whole, or calculate the weighted average of the expected returns of the individual stocks that make up the portfolio. Which return is​ higher? ​(Select the best choice​ below.) A. The weighted average expected return of the individual stocks is higher because returns are concave. B. Impossible to​ tell, it depends on the portfolio. C. Neitherboth calculations give the same answer. D. The weighted average expected return of the individual stocks is higher because returns are convex.