i completed by part a but need help with part b and c.

You have been given the following return data, B. on three assets-A, B, and C-over the period 2021-2024. Using these assets, you have isolated three investment alternatives: a. Calculate the average portfolio return for each of the three alternatives. b. Calculate the standard deviation of returns for each of the three alternatives. c. On the basis of your findings in parts a and b, which of the three investment alternatives would you recommend? Why? a. Calculate the portfolio return over the 4-year period for each of the 3 alternatives. Alternative 1: 8 % (Round to two decimal places.) Alternative 2: 8.6 % (Round to two decimal places.) Alternative 3: 8.6 % (Round to two decimal places.) b. Calculate the standard deviation of returns over the 4-year period for each of the 3 alternatives. Alternative 1: % (Round to three decimal places.) Year 2021 2022 2023 2024 Expected Return Asset A Asset B Asset C 5% 12% 6% 7% 10% 8% 9% 8% 10% 11% 6% 12% Alternative 1 Investment 100% of asset A 40% of asset A and 60% of asset B 40% of asset A and 60% of asset C 2 3