The histoncal retums for two investments - A and B-are summarized in the following table for the period 2016 to 2020 , Use the data to answer the questons that foliow a. On the basis of a revew of the retum data, which investenent appears to be more risky? Why? b. Calculate the standard deviason for each imestments 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 a. On the basis of a review of the return data, which investment appears to be more risky? A. Imvestment A and investment B have equal risk because the average felums are th 18. The riskipr investment appears to be investment B, with returns that are closer to th- Data table C. The risker imvestment appears to be investment A, weh returns frat vary widely frod D. The risker investment appears to be investrment B, with returns that vary widely frod b. The standard devation for invetument A is 1. (Round to two decimal places.)