For each of the following pairs of investments, state which would always be preferred by a rational investor (assuming that these are the only investments available to the investor):
a. Portfolio A r = 18% σ = 20%
Portfolio B r = 14% σ = 20%
b. Portfolio C r = 15% σ = 18%
Portfolio D r = 13% σ = 8%
c. Portfolio E r = 14% σ = 16%
Portfolio F r = 14% σ = 10%
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