Answer:
The correct answer is option C.
Step-by-step explanation:
The current spot rate for the Norwegian kroner is $1 = NKr6.6869. 
The expected inflation rate in Norway is 6 percent and that in the US is 3.1%. 
The risk-free rate of return in the US is 4%. 
Risk free rate in US - Inflation rate = Risk free rate in Norway - Inflation rate 
4% - 3.1% = Risk free rate - 6% 
Risk free rate in Norway = 0.9% + 6% 
Risk free rate in Norway = 6.9%