The exchange rate of the Mexican peso against the $US\$ $ changed from $10{\text{ }}pesos = 1{\text{}}US\$ $ to $9{\text{ }}pesos = 1{\text{ }}US\$ $. During the same period, the general price level in Mexico fell by 10% while the US price level remained unchanged.
What happened to the nominal and real exchange rate of the peso against the US$?

1 )
A
B
3 )
C
4 )
D
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