The US Dollar Would Appreciate If:
A) $\left( t ^ { U S } - t ^ { W } \right) \uparrow$

The U.S. dollar would appreciate if:

A) $\left( t ^ { U S } - t ^ { W } \right) \uparrow$
B) $t^{w} \uparrow$
C) $t ^{ US } \downarrow$
D) $\left( i ^ { U S } - i ^ { W } \right) \downarrow$
E) the federal reserve buys bonds