Which one of the following statements is the most accurate?
a) For a fixed interest rate, a rise in the expected future exchange rate does not cause a change in the current exchange rate.
b) For a fixed interest rate, a rise in the expected future exchange rate causes a fall in the current exchange rate.
c) For a given dollar interest rate and a constant expected exchange rate, a rise in the interest rate of the euro causes the dollar to depreciate.
d) For a fixed interest rate, a rise in the expected future exchange rate causes a rise in the current exchange rate.
e) None of the above.

Please explain your answer.