Standard deviation and expected return information for

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Standard deviation and expected return information for four investments selling for the same price is as follows:

Investment Standard Deviation Expected Return

O A 25% 20%

O B 20% 18%

O C 12% 8%

O D 10% 10%
What investment is the best choice in terms of the risk/return relationship?
Please provide the calculation for each of the four options and the reference source