The four currencies that constitute about 80% of all foreign exchange trading are
A.
U.K pound, Chinese yuan, euro, and Japanese yen.
B.
U.S. dollar, euro, Chinese yuan, and U.K. pound.
C.
U.S. dollar, Japanese yen, euro, and U.K. pound.
D.
U.S. dollar, U.K. pound, yen, and Chinese yuan.