Refer to the Diagram Below Where D and S Are

Refer to the diagram below where D and S are Canada's demand for and supply of Swiss francs. At the equilibrium exchange rate, E, Canada's balance of payments is in equilibrium. A shift of the demand curve to D' might be the result of:

A) a relative decline in interest rates in Switzerland.
B) a reduction in Canada's relative price level.
C) a recession in Canada, which slows its rate of growth.
D) a relative decline in interest rates in Canada.