The historical returns for two investments_A and B-are summarized in the following table for the period 2016 to 2020, Use the data to answer the questions that follow. a. On the basis of a review of the return data, which investment appears to be more risky? Why? b. Calculate the standard deviation for each investment's returns. c. On the basis of your calculations in part b, which investment is more risky? Compare this conclusion to your observation in part a. Data table corner of the data table below in order to copy its contents into a spreadsheet.)