All Things Considered,it Is Unlikely That Equality of Real Interest

All things considered,it is unlikely that equality of real interest rates across countries is a good description of reality,especially in the short run.The following options explain the reasons for this EXCEPT:

A) identical nominal returns imply very different real returns for investors in different countries.
B) returns in different currencies can have different currency risk premiums.
C) political risks or the threat of capital controls prevent investors from taking advantage of higher returns in other countries.
D) PPP deviations are not sizable and prolonged.