If We Let P = the Domestic Price of a Basket

If we let P = the domestic price of a basket of goods and P _f = the foreign price of the same basket of goods, and $\varepsilon$ = the nominal exchange rate of foreign currency/$U.S., the real exchange rate is best expressed as:

A) $\frac { P } { P _ { f } \cdot \varepsilon }$
B) $\frac { P _ { f } } { P }$
C) $\frac { P _ { f } } { P \cdot \varepsilon }$
D) $\varepsilon \cdot \frac { P } { P _ { f } }$