The expectation that the U.S. will appreciate in the future would lead to:
选项：

A: a decrease in the U.S. demand for euros and an increase in the U.S. supply of euros
B: an increase in the U.S. demand for euros and a decrease in the U.S. supply of euros
C: an increase in the U.S. demand and supply of euros
D: a decrease in the U.S. demand and supply of euros