The US Dollar Would Appreciate If:
A) $t^{us} \uparrow$ B) $E\downarrow$ C) $t^{us} \downarrow$

The U.S. dollar would appreciate if:

A) $t^{us} \uparrow$
B) $E\downarrow$
C) $t^{us} \downarrow$
D) $t^{w} \uparrow$
E) the federal reserve buys bonds