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


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