Which of These Statements Is the Best Description of a Foreign

Which of these statements is the best description of a foreign exchange intervention?

A) Domestic consumers act to influence the exchange rate of their country's currency.
B) Central banks and/or national governments act to influence the exchange rate of their country or another country's currency.
C) Political action groups lobby governments to influence the exchange rate of their country's currency.
D) Foreign companies act to influence the exchange rate of another country's currency.