The US Central Bank raises its interest rate to improve its balance of payments position. The diagram shows the resulting changes in the demand for and supply of US$ in the foreign exchange market.
What should curves W, X, Y and Z be labelled to show the effect of the interest rate rise on the exchange rate? (Assume a change is shown by a move from a curve numbered 1 to a curve numbered 2.)

1 )
A
2 )
B
3 )
C
D
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