Why the answer is C. Please explain

Assume an investor with the following utility function: U E() 3/2() To maximize her expected utility, which one of the following investment alternatives would she choose? A. A portfolio that pays 10% with a 60% probability or 5% with 40% probability. B. A portfolio that pays 10% with 40% probability or 5% with a 60% probability. A portfolio that pays 12% with 60% probability or 5% with 40% probability. D. A portfolio that pays 12% with 40% probability or 5% with 60% probability. uc)-9.02%; highest utility of possibilities. 4GSR Analvtic