Suppose That the Exchange Rate Between the British Pound and Gold

Multiple Choice

Suppose that the exchange rate between the British pound and gold was £20 per ounce of
Gold and the exchange rate between the U.S. dollar and gold was $80 per ounce of gold. What is the U.S. dollar exchange rate with respect to the British pound?

A) $1 exchanges for £4.
B) $1 exchanges for £0.4.
C) $1 exchanges for £0.25.
D) $1 exchanges for 0.25 ounces of gold in Britain.