and Mrs. Johnson's portfolio contains 15 stock selected based security analyses of severalindustries.The most appropriate orcomplete measure of the...

Mr. and Mrs. Johnson's portfolio contains 15 stock selected based security analyses of several industries. The most appropriate or complete measure of the risk of the portfolio is

A.the beta of the individual stocks

B.the weighed average beta of the portfolio

C.the standard deviation of the portfolio

D.the unique risk of individual stocks

E.the undiversifiable risk of individual stocks.