If a USDollar Purchases 4 Argentinean Pesos,and a Gallon of Milk Costs

Multiple Choice

If a U.S.dollar purchases 4 Argentinean pesos,and a gallon of milk costs $3 in the U.S.and 6 pesos in Argentina what is the real exchange rate?

A) 2
B) 3/2
C) 2/3
D) 1/2