Use the Following Information,which Describes the Expected Return and Standard

Use the following information,which describes the expected return and standard deviation for three different assets,to answer the following question(s) .
Portfolio X Portfolio Y Portfolio Z
Expected return 9.5% 8.8% 9.5%
Standard deviation 4.9% 5.5% 5.5%
-If an investor must choose between investing in either portfolio X or portfolio Y,then

A) she will always choose Asset X over Asset Y.
B) she will always choose Asset Y over Asset X.
C) she will be indifferent between investing in Asset X and Asset Y.
D) none of the above.