单项选择题

Questions 17 ~ 20 are based on the following talk about the global economy from 1973 to 1990s. You now have 20 seconds to rend Questions 17 ~ 20.
Which was the major cause of the emergence of the global economy in 1973

A.The drop in economies of industrialized nations caused by the rise of oil price.
B.The cease of the United States’ dominant position in the world economy.
C.The competition from Western Europe and Japan to the U. S. in international trade.
D.All of the above.