Calculate the weighted mean of the ror's for each portfolio. based on the results, which list shows a comparison of the overall performance of the portfolio's, from worst to best? ror portfolio 1 portfolio 2 portfolio 3 10.4% $700 $6000 $3500 -29.7% $12,000 $9000 $5500 37.2% $600 $4500 $5750 7.5% $4,400 $2000 $1500 6.3% $250 $1,100 $4500 a- portfolio 3, portfolio 1, portfolio 2 b- portfolio 3, portfolio 2, portfolio 1 c- portfolio 1, portfolio 2, portfolio 3 d- portfolio 1, portfolio 3, portfolio 2