To Force the Value of the Pound to Appreciate Against

To force the value of the pound to appreciate against the dollar, the Federal Reserve should:

A) sell dollars for pounds in the foreign exchange market and the European Central Bank (ECB) should sell dollars for pounds in the foreign exchange market.
B) sell pounds for dollars in the foreign exchange market and the European Central Bank (ECB) should sell dollars for pounds in the foreign exchange market.
C) sell pounds for dollars in the foreign exchange market and the European Central Bank (ECB) should not intervene.
D) sell dollars for pounds in the foreign exchange market and the European Central Bank (ECB) should sell pounds for dollars in the foreign exchange market.